JP2002003665A - Polymer material for laser processing, flexographic printing plate and seal material using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polymer material for laser processing excellent in laser processing characteristics which does not generate odor at the time of laser processing, does not emit flame, has no sticky processing surface, and has excellent laser processing characteristics. A flexographic printing plate and a stamp material having an engraving depth are provided. SOLUTION: (A) a polymer material containing 45% by mass or more of ethylene units as a repeating unit, and (B) a polymer material for laser processing obtained by crosslinking a polymer composition containing an organic peroxide. I do. Further, a polymer material for laser processing is obtained by foaming and cross-linking a polymer composition further containing (C) a foaming agent in (A) and (B). As the polymer (A), a copolymer rubber of ethylene, an α-olefin such as propylene and 1-butene, and a non-conjugated polyene such as 5-ethylidene-2-norbornene can be used. Further, as the organic peroxide (B), t
-Butyl cumyl peroxide, dicumyl peroxide and the like are preferred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer material suitable for engraving by laser processing, and a flexographic printing plate and a stamp material using the same. More specifically, a laser processing polymer material having excellent laser processing characteristics without odor generated at the time of laser processing, flame generation during laser processing, non-stickiness of the processing surface, and a flexographic printing plate using the same, For seal materials. The polymer material for laser processing of the present invention can be used in a wide range of applications in the field of laser processing products such as flexographic printing plates and stamping materials, stamps for electronic parts, industrial rubber, etc. It can be a laser-processed product having.

[0002]

2. Description of the Related Art As a method of forming a printing plate by forming irregularities on the surface of a polymer material, a method of engraving a vulcanized rubber sheet with a sword is common. However, the method using this sword requires a high level of hand-digging techniques, and thus requires skill and has limitations in engraving fine and complicated characters and figures.

[0003] On the other hand, a method of making a plate by cross-linking and curing a photosensitive resin with ultraviolet rays has been practiced. However, while fine and complicated characters or figures can be easily engraved, a large amount of an organic solvent is required during development. Therefore, there is a problem of deterioration of the working environment and pollution of the natural environment. Recently, a method using a laser processing machine has been developed.
When laser processing is performed on a stamping material made of a rubber material such as nitrile rubber, there is a problem that an unpleasant and strong burnt rubber odor is generated, and the working environment and the surrounding environment are polluted.

[0004] Further, silicone rubber-based materials have also been developed, and the odor during laser processing is reduced as compared with conventional rubber materials. However, during work, flame may be emitted from the surface of the stamping material, poor reproducibility of fine and complicated patterns,
In addition, there is a problem that stickiness remains on the surface of the printing material after laser processing and ink is repelled.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and does not generate odor at the time of laser processing, does not cause flames, and has a surface of a stamping material after processing. It is an object of the present invention to provide a polymer material having reduced stickiness and excellent laser processing characteristics, and a flexographic printing plate and a stamp material having a sufficient engraving depth.

[0006]

The polymer material for laser processing according to the first invention comprises (A) 45% by mass as a repeating unit.
It is characterized in that a polymer composition containing the above-mentioned polymer containing ethylene units and (B) an organic peroxide is crosslinked.

Further, the polymer material for laser processing according to the second invention comprises (A) a polymer containing 45% by mass or more of ethylene units as a repeating unit, (B) an organic peroxide,
(C) A polymer composition containing a foaming agent is foamed and crosslinked.

The above-mentioned “(A) a polymer containing 45% by mass or more of ethylene units as a repeating unit” [hereinafter referred to as polymer (A)]. ] Need only contain 45% by mass or more of ethylene units as a repeating unit, and other repeating units and the like are not limited at all. In the polymer (A), when the ethylene unit is less than 45% by mass, the odor at the time of laser processing increases, and the mechanical strength of the polymer material also decreases.
On the other hand, if the ethylene unit exceeds 97% by mass, the rigidity of the printing plate or the like becomes too large. Therefore, especially in printing on cardboard or the like, it is not possible to sufficiently follow the deformation of the printing surface, and clear printing may not be performed. The content of the ethylene unit is more preferably 45 to 97% by mass, particularly preferably 50 to 70% by mass,
When the content is within this range, a printing plate or the like that does not generate odor during laser processing and has sufficient flexibility can be obtained.

The monomer forming a repeating unit other than the ethylene unit in the polymer (A) is not particularly limited.
α-olefins and non-conjugated polyenes. α
-As the olefin, propylene, 1-butene, 1-
Hexene, 4-methyl-1-pentene, 1-heptene,
5-methyl-1-hexene, 1-octene, 5-ethyl-1-hexene, 1-nonene, 1-decene and the like. As the α-olefin, propylene, 1-butene and 1-octene are preferable. In particular, if the α-olefin has 4 or more carbon atoms, a more flexible and easily deformable printing plate can be obtained. One of these α-olefins may be used alone, or two or more thereof may be used in combination.

Examples of the non-conjugated polyene include 5-ethylidene-2-norbornene, dicyclopentadiene, 5-propylidene-2-norbornene, 5-vinyl-2-norbornene, 2,5-norbornadiene, 1,4-cyclohexadiene, Cyclic polyenes such as 1,4-cyclooctadiene; Also, 1,4-hexadiene, 1,
Examples include chain polyenes such as 5-heptadiene, 1,6-octadiene, 1,7-nonadiene, and 1,8-decadiene. Examples of the non-conjugated polyene include 5-ethylidene-2-norbornene, dicyclopentadiene, 1,4-
Hexadiene is preferred. These non-conjugated polyenes are 1
Only the species may be used, or two or more species may be used in combination.

Examples of the polymer (A) containing an ethylene unit and an α-olefin unit as a repeating unit include ethylene-propylene rubber and ethylene-butene rubber. Further, as the polymer (A) containing an ethylene unit, an α-olefin unit and a non-conjugated polyene unit, ethylene-propylene-5-ethylidene-2-norbornene rubber, ethylene-butene-dicyclopentadiene rubber and the like can be mentioned. These usually contain 50 to 70% by mass of ethylene units, and can be a laser-processed product having excellent laser processing characteristics.

The polymer (A) may further have a repeating unit composed of another monomer. Examples of the monomer forming such a repeating unit include vinyl acetate, vinyl alcohol, styrene and ( Examples thereof include (meth) acrylonitrile, (meth) acrylic acid and alkali metal salts thereof, and (meth) acrylate. One of these monomers may be used alone, or two or more thereof may be used in combination. Incidentally, these monomers may be used in combination with at least one of an α-olefin and a non-conjugated polyene, and the polymer (A) may be a polymer formed by ethylene and any monomer other than ethylene. It may be united.

Further, the polymer (A) may be a polymer having an acid anhydride group or an acid anhydride unit. Examples of the acid anhydride include maleic anhydride, phthalic anhydride, and succinic anhydride. The acid anhydride group is obtained by copolymerizing ethylene, a monomer having a polymerizable unsaturated group and an acid anhydride group, and, if necessary, another monomer to obtain a polymer (A). Can be introduced into the molecular chain. The acid anhydride unit is obtained by copolymerizing an acid anhydride having a polymerizable unsaturated group such as maleic anhydride with another monomer containing ethylene, or by graft-polymerizing the polymer with an ethylene unit. Can be formed.

The polymer (A) may be blended with another polymer, if necessary. Such polymers include natural rubber, butadiene rubber, styrene-
Butadiene rubber, isoprene rubber, nitrile rubber, acrylic rubber, vinyl chloride resin, butyl rubber, fluoro rubber,
Examples include silicone rubber, urethane rubber, and polyvinyl alcohol. One of these polymers may be used alone, or two or more thereof may be used in combination. The content of these polymers is preferably 50 parts or less, particularly preferably 30 parts or less based on 100 parts by mass of the polymer (A) (hereinafter abbreviated as “parts”), and is included in the polymer (A). When the number of ethylene units is relatively small, the amount is preferably smaller. If the amount ratio of the polymer to be blended exceeds 50 parts, the odor at the time of laser processing is increased, which is not preferable.

The “(B) organic peroxide” is represented by the general formula R
^{1 -O-O-R 2 (} R 1 is an alkyl group or an acyl group, R ² is an alkyl group, an acyl group or a hydrogen atom.) Is a compound represented by the.

Examples of the organic peroxide include t-butyl hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, p-menthane hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide. , 2,5-
Dimethylhexane-2,5-dihydroperoxide, 1,1-di-t-butylperoxy-3,3,5-
Trimethylcyclohexane, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, 1,1-bis (t-butylperoxy) cyclododecane, 2,2-bis (t-butylperoxy)
Octane, 1,1-di-t-butylperoxycyclohexane, 2,5-dimethyl-2,5-di- (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di- (t -Butylperoxy) hexyne, 1,3 bis (t
-Butylperoxy-i-propyl) benzene, 2.5
-Dimethyl-2,5-di- (benzoylperoxy) hexane, 1,1-bis (t-butylperoxy) -3,
3,5-trimethylcyclohexane, n-butyl-4,
4-bis (t-butylperoxy) valerate, bayoyl peroxide, m-toluyl peroxide, p
-Chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, t-butylperoxyisobutyrate, t-butylperoxy-2-ethylhexanoate, t-butylperoxybenzoate, t-butylperoxy- i-propyl carbonate, t-butyl peroxyallyl carbonate, and the like.

The organic peroxide can be appropriately selected and used depending on the processing conditions and the like. t-butylcumyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di- (t-butylperoxy) hexane, 1,3 bis (t-butylperoxy-i-propyl) benzene and the like Is preferred. These organic peroxides
One type may be used alone, or two or more types may be used in combination.

The organic peroxide can be blended usually in an amount of 0.1 to 30 parts, especially 0.1 to 15 parts, more preferably 0.1 to 10 parts, per 100 parts of the polymer (A). It is preferable to mix parts. When the compounding amount of the organic peroxide is less than 0.1 part, the polymer (A) is not sufficiently crosslinked, and the mechanical strength of the polymer material for laser processing tends to decrease. On the other hand, if the compounding amount exceeds 30 parts, the polymer (A) is excessively crosslinked, becomes hard and brittle, and the mechanical and thermal stability of the polymer material for laser processing may be greatly reduced. Not preferred.

For crosslinking of the polymer (A), an organic peroxide and a monomer capable of forming a crosslinked structure between molecules can be used in combination. Examples of the crosslinkable monomer include ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, allyl methacrylate, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, divinyl adipate, maleic anhydride, N, Nm-phenylene bismaleimide, divinylbenzene, diallylmaleimide, diphenylguanidine and the like can be mentioned.

The molecules of the polymer (A) such as aluminum acrylate, aluminum methacrylate, zinc acrylate, zinc methacrylate, zinc dimethacrylate, magnesium acrylate, magnesium methacrylate, calcium acrylate, calcium methacrylate, etc. A monomer capable of forming a metal bridge therebetween can also be used. Furthermore,
In addition to these monomers, liquid polybutadiene, liquid rubber such as liquid styrene-butadiene rubber, dimethylaniline,
Quaternary ammoniums and the like can be used in combination with the organic peroxide.

As in the second invention, the polymer material for laser processing can be obtained by foaming and crosslinking the polymer (A). By foaming with crosslinking in this way, it is possible to obtain a printing plate or the like having a sufficient engraving depth even when the printing plate or the like is manufactured, particularly even when the scanning speed of laser light is increased. Can be manufactured well.

The "(C) foaming agent" includes (1) sodium bicarbonate and its paste or fine powder, inorganic foaming agents such as ammonium bicarbonate and ammonium carbonate, and (2)
Nitroso compounds such as N, N'-dinitrosopentamethylenetetramine, (3) azodicarbonamide and a composite blowing agent containing the same as a main component, azo compounds such as azobisisobutyronitrile, (4) benzenesulfonylhydrazide, Examples thereof include sulfonyl hydrazides such as p, p'-oxybis (benzenesulfonyl hydrazide), toluenesulfonyl hydrazide, and p-toluenesulfonyl semicarbazide.

As the foaming agent, N, N'-dinitrosopentamethylenetetramine, azodicarbonamide, p,
p'-Oxybis (benzenesulfonyl hydrazide) is preferred. Also, only one foaming agent may be used,
Two or more kinds can be used in combination, and different kinds of foaming agents can be used in combination.

The foaming agent is usually used in combination with a foaming assistant. Examples of the foaming aid include salicylic acid, urea, and compounds thereof. Specifically, the product name “Cell Paste” series manufactured by Eiwa Chemical Co., Ltd., the product name “BK” manufactured by Ouchi Shinko Chemical Co., Ltd., the product name “Celton” series manufactured by Sankyo Chemical Co., Ltd., Shiraishi Calcium The product name “Aidon” manufactured by Co., Ltd. is provided. One of these foaming assistants may be used alone, or two or more thereof may be used in combination.

In the first and second inventions, a reinforcing agent, a plasticizer, an activator, a flame retardant, an antioxidant, a colorant, a pigment, and the like can be added to the polymer composition, if necessary. . As a reinforcing agent, other than carbon black, calcium carbonate, a special calcium carbonate-based compound comprising a composite of calcium carbonate and magnesium carbonate, magnesium carbonate, dry silica, wet silica, colloidal silica,
White reinforcing agents such as clay and talc can be used. One of these reinforcing agents may be used alone, or two or more thereof may be used in combination.

Aromatic, naphthenic or paraffinic process oils can be used as the plasticizer. As the activator, zinc white (zinc oxide) which also acts as a vulcanization accelerating agent can be used. In addition to ordinary varieties, active zinc white, transparent zinc white, surface-treated zinc white, Special varieties such as composite zinc white can also be used. Furthermore, as other inorganic activators,
Magnesium oxide, red lead, white lead, etc. can also be used, and organic activators such as fatty acids such as stearic acid, oleic acid and lauric acid, and fatty acid derivatives such as zinc stearate and dibutylammonium oleate can be used it can.

Examples of the flame retardant include antimony oxide, antimony, paraffin chloride, bromine, zirconium, phosphate and the like, as well as aluminum hydroxide, magnesium hydroxide, zinc borate and the like. As an anti-aging agent, p-phenylenediamine,
Compounds such as quinoline, phenol and hindered phenol are often used.

Examples of the coloring agent and pigment include titanium oxide, zinc oxide, lithopone, lead white, lead yellow, cadmium yellow, barium yellow, cadmium red, molybdenum red, leadtan (Koumeitan),
Inorganic materials such as amber, ultramarine, navy blue, cobalt blue, chromium oxide green, and cobalt purple can be used. Also, Benzidine Yellow G, Brilliant Carmine 6
Organic substances such as B, permanent F-5R, lake red C, and phthalocyanine green can also be used. One of these colorants and pigments may be used alone, or two or more thereof may be used in combination.

The polymer composition can be prepared by a general kneader, extruder or the like. As a preparation procedure,
After kneading the polymer (A) and a reinforcing agent, a plasticizer, an activator, and the like in advance using a Banbury mixer, a kneader, or the like, the kneaded product is mixed with an organic peroxide using a roll or the like.
Further, a method of blending and kneading a foaming agent and a foaming assistant, and the like can be given.

The polymer composition prepared by such a procedure can be prepared by a conventional method for producing a vulcanized rubber, for example,
The polymer composition is filled in a mold, heated to crosslink,
In the invention, a polymer material for laser processing can be obtained by foaming and crosslinking. Further, after the polymer composition is molded into a predetermined shape by an extruder, the molded article is heated and cross-linked, and in the second invention, foamed and cross-linked to obtain a polymer material for laser processing.

The polymer material for laser processing according to the first and second aspects of the present invention is a polymer material suitable for engraving by laser processing, and does not generate odor at the time of laser processing. It has excellent laser processing characteristics with almost no odor, little flame on laser processing and no stickiness on the processed surface. Therefore, the third to fifth
As in the invention, a flexographic printing plate or a stamp material having a sufficient engraving depth can be obtained. In particular, according to the polymer material for laser processing formed by foaming with crosslinking as in the second invention, a printing plate or the like having a sufficient engraving depth can be more easily produced. Further, as in the fourth to sixth aspects, another member, particularly a flexible member such as a polyurethane foam, is laminated on the side other than the printing surface or the seal surface and joined, so that printing or stamping is performed. The required printing pressure can be reduced. Further, the weight can be reduced at the same time, and this reduction is particularly preferable for a relatively large printing plate used for a cardboard or the like.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail by way of examples. In the following Examples and Comparative Examples, the amounts of the polymers, organic peroxides, reinforcing agents, and the like used (units:
Parts) are based on 100 parts of the polymer (A). Example 1 (1) Preparation of kneaded product of polymer (A) and reinforcing agent etc. Ethylene-propylene-non-conjugated diene rubber (represented as "EPDM" in Table 1) as polymer (A) (ethylene unit content) ; 61% by mass, manufactured by JSR Co., Ltd.
Trade name "JSR EP21") was used. 100 parts of this polymer (A), 5 parts of zinc oxide, 1 part of stearic acid, 5 parts of titanium oxide, 50 parts of silica (Nipsil VN3, manufactured by Nippon Silica Co., Ltd.), 50 parts of calcium carbonate
And 60 parts of a plasticizer (trade name “Diana Process Oil PW380” manufactured by Idemitsu Kosan Co., Ltd.) were charged into a kneader adjusted to 50 ° C., and kneaded for 15 minutes to prepare a kneaded material.

(2) Preparation of polymer composition and preparation of cross-linked sheet The kneaded product in (1) was put into a 4-inch roll adjusted to 50 ° C., and then converted into an organic peroxide by Kayaku Akzo Co., Ltd. Made, trade name "Parcadox 14/40" 5
Parts, 2 parts of triallyl isocyanurate as a crosslinkable monomer were further added and kneaded sufficiently to obtain a polymer composition.
Thereafter, the polymer composition was filled in a mold having a depth of 2 mm, and
Pressing for 25 minutes with a compression molding machine adjusted to 70 ° C,
A crosslinked sheet was produced.

(3) Evaluation of laser processability A sealed carbon dioxide laser oscillator (manufactured by Thinrad, USA)
Power: 25W) equipped with a laser processing machine (Grea
Laser processing of the crosslinked sheet produced in (2) using t Computer Corporation (trade name “Laser Pro”) was performed, and the odor, flame, and stickiness of the processed surface during processing were evaluated (sensory test).
The engraving depth was measured. The settings of the laser processing machine were SPEED 20 (%), POWER 100 (%) and resolution 1000 (dpi).

Example 2 In Example 1 (2), azodicarbonamide as a foaming agent was used together with an organic peroxide and a crosslinkable monomer.
Parts, and a cross-linked foam sheet made of a low-foamed material having an expansion ratio of 1.1 times in the same manner as in Example 1 except that 2 parts of “Celton NP” (trade name, manufactured by Sankyo Kasei Co., Ltd.) were added as a foaming aid. Was prepared, and the laser processability of this crosslinked foamed sheet was evaluated in the same manner as in Example 1.

Example 3 Example 1 (1) was the same as Example 1 except that the reinforcing agent (titanium oxide, silica and calcium carbonate) was changed to 50 parts of carbon black (trade name "SEIST S", manufactured by Tokai Carbon Co., Ltd.). Similarly, a kneaded material was prepared. Thereafter, a crosslinked sheet was prepared in the same manner as in (2) of Example 1, and the laser workability of this crosslinked sheet was evaluated in the same manner as in Example 1.

Example 4 Using the kneaded material prepared in Example 3, a cross-linked foamed sheet made of a low-foamed material having an expansion ratio of 1.1 was prepared in the same manner as in Example 2, and the crosslinked foamed sheet was subjected to laser irradiation. Workability was evaluated in the same manner as in Example 1.

Example 5 In (1) of Example 1, as the polymer (A), 100 parts of the above-mentioned ethylene-propylene-nonconjugated diene rubber and a nitrile rubber (represented as "NBR" in Table 1) (J) Product name "JSR N250"
S ") A kneaded product was prepared in the same manner except that 25 parts were used in combination. Thereafter, a crosslinked sheet was prepared in the same manner as in (2) of Example 1, and the laser workability of this crosslinked sheet was evaluated in the same manner as in Example 1.

Example 6 Using the kneaded material prepared in Example 5, a cross-linked foamed sheet made of a low-foamed material having an expansion ratio of 1.1 was prepared in the same manner as in Example 2, and the crosslinked foamed sheet was subjected to laser irradiation. Workability was evaluated in the same manner as in Example 1.

Comparative Example 1 In Example 1 (1), the nitrile rubber used in Example 5 (indicated as “NBR” in Table 1) was used instead of the ethylene-propylene-non-conjugated diene rubber.
A kneaded product was prepared in the same manner except that parts were used. Thereafter, a crosslinked sheet was prepared in the same manner as in (2) of Example 1, and the laser workability of this crosslinked sheet was evaluated in the same manner as in Example 1.

Comparative Example 2 Using the kneaded material prepared in Example 1, (1),
(2), in place of the organic peroxide and the crosslinkable monomer, 2 parts of sulfur as a vulcanizing agent, and as a vulcanization accelerator, a product name “NOCCELER” manufactured by Ouchi Shinko Chemical Industry Co., Ltd.
CZ "[In Table 1, it is represented as" vulcanization accelerator (a) ". ] Is represented by 2 parts, trade name "NOCCELER BZ" [in Table 1, "vulcanization accelerator (b)". ] Is represented by one part and trade name "NOCCELER TS" [in Table 1, "vulcanization accelerator (c)". ] Was used in the same manner as in Example 1 except that one part was used, and the laser processability of this crosslinked sheet was evaluated in the same manner as in Example 1.

Comparative Example 3 Ethylene-vinyl acetate copolymer (referred to as "EVA" in Table 1) (ethylene unit content: 40% by mass, trade name "Soabrene CH" manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) And a sheet was produced by pressing for 5 minutes using a compression molding machine adjusted to 100 ° C., and the laser workability of this sheet was evaluated in the same manner as in Example 1. As described above, Examples 1 to
Table 1 shows the evaluation results of the laser processability of Comparative Example 6 and Comparative Examples 1 to 3.

[0043]

[Table 1]

According to the results shown in Table 1, the crosslinked sheets or crosslinked foamed sheets of Examples 1 to 6 did not generate odor during laser processing, did not generate flame, and did not have any sticky surface after processing. , And has a sufficient engraving depth. On the other hand, Comparative Example 1 using NBR, EPDM
However, in Comparative Example 2 which was vulcanized with sulfur, an unpleasant burn rubber odor was generated during laser processing. In Comparative Example 3 using only EVA having an ethylene unit content of less than 45% by mass, an unpleasant acidic odor was generated during laser processing.

[0045]

According to the first aspect of the present invention, it is possible to obtain a polymer material for laser processing which does not generate odor during laser processing, does not emit flame, has no sticky processing surface, and has excellent laser processing characteristics. it can. Further, according to the second invention, a polymer material for laser processing that can easily produce a printing plate or the like having a sufficient engraving depth can be obtained.
These polymer materials for laser processing can be used as the flexographic printing plate of the third invention and the seal material of the fifth invention. In particular, as in the fourth to sixth inventions, a flexible foam or the like is laminated. By doing so, a clear printing surface or the like can be obtained with a low printing pressure.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/14 C08K 5/14 (72) Inventor Tadaaki Tanaka 2-11-24 Tsukiji, Chuo-ku, Tokyo J F-term (reference) within SRL Co., Ltd. AC32.

Claims (6)

[Claims] 1. A laser obtained by crosslinking a polymer composition containing (A) a polymer containing 45% by mass or more of ethylene units as a repeating unit and (B) an organic peroxide. Polymeric materials for processing. 2. A polymer composition comprising (A) a polymer containing 45% by mass or more of ethylene units as a repeating unit, (B) an organic peroxide, and (C) a foaming agent is foamed and crosslinked. A polymer material for laser processing characterized by being obtained. 3. A flexographic printing plate comprising the polymer material for laser processing according to claim 1 or 2. 4. The flexographic printing plate according to claim 3, wherein another member is laminated on a side other than the printing surface. 5. A seal material comprising the polymer material for laser processing according to claim 1 or 2. 6. The seal material according to claim 5, wherein another member is laminated on a side other than the seal surface.