US1989711A - Light colored coating composition - Google Patents

Description

PATEN oF 3,989,711 LIGHT COLGRED COATING COMPOSITION Paul Robinson, Llanerch, and Ben E. Sorenson, Philadelphia, Pa, ore to E. I. du Pont de Nemours & Company, Wilmington, Belt, is corporation of Delaware No Drawing. Application August 2 1930 Serial No. male This invention relates to coating compositions to dry on the upper surface only, remaining soft and more particularly to those coating composion the surface in contact with the article being tions based upon resinous substances combined coated for extended periods of time. Some of or modified with drying oils or drying oil ccnthese driers are unstable inthe solutionsinwhich 5 stituents and more specifically to those coating they are used and precipitate out on standing 5 compositions made from oil modified polyhydric or on drying causing the surface of the film to alcohol-polybasic acid resins. be discontinuous and to present a rough appear- Coating compositions based upon synthetic oleo ance and sometimes a low gloss. resinous materials have been known for some Attemptstosubstitute other oxidation catalysts time. Very useful coating compositions can be for metallic driers in compositions containing 10 made from phenol formaldehyde resins modified oils and certain oleo resinous materials are not with rosin or other gums and incorporated into successful because the sufiiciently rapid drying drying oils. Exceedingly useful coating materials cannot be secured by the combination obtained. can also be made from the oil modified polyhydric To the best of our knowledge, however, organic alcohol-polybasic acid resins. Coating composidriers of the type disclosed herein have not previ- 15 tions of this sort dry more rapidly than correously been used to replace all or the major part sponding oleo resinous varnishes made from oils of the drier in oil modified polyhydric alcohol-v and natural gums. With the use of any of the polybasic acid resinous coating compositions as above mentioned materials, however, it has heremore fully hereinafter set forth.

2Q tofore been necessary to add to these composi- Thisinvention has asan object the preparation tions metallic soaps or driers. These substances of light colored coating compositions which shall are omdation catalysts for the drying of oils. be initially very light in color and shall retain Their addition has been necessary in order to get their light color for extended periods of time even sufiiciently rapid drying speed and at the same when exposedinunfavorable locations. Afurther 1 time satisfactory durability and application propobject is to prepare light colored coating composi- 25 erties. These driers are for the most .part'soaps tions which will not undergo undesirable oxidaor oils soluble salts of metals such asjlead, mantion on storage. A still further object is to preganese an pare light colored coating compositions, the films A o e metallic fi ers very markedly inof which will dry evenly thruout their entire 1 crease the rate of dry or synthetic resin composithickness. A still further object is to prepare tions including the polyhydric alcohol-polybasic light colored'coating compositions which will be acid resin type their use is attended with numerstable in the liquid condition and which will not ous disadvantages. One of the disadvantages develop properties which will cause an uneven attending the use of these driers resides in the film having a low degree of gloss. A still further fact that they are highly colored and even in object is to prepare coating compositions which 35 small amounts impart an objectionable dark color can be baked or force dried without becoming to the product. This discoloration is more seriseriously discolored. Additional objects will apous when the coating, compositions are dried by pear hereinafter. baking rather than by exposure to the air at room These objects are accomplished by the follow- 40 temperatures. It also increases on exposure of ing invention in which organic peroxides are inthe film in warm and dark locations out of con-- corporated into coating compositions made with tact with direct light. From a manufacturing oil modified polyhydric alcohol-polybasic acid standpoint the use of driers is also a disadvantage resins.

- in h it gives difficulty in mixing nd grinding We have found that attempts to substitute oroperations causing the material to lump and to ganic peroxides for metallic driers in coating com- 45 form skins. The tendency to skin over the surpositions containing oils or oleo resinous varnishes face, also appears when the materials are placed made from natural gums do not yield composiincontainers that are not completely filled. Many tions that dry at a sufficiently rapid rate to be of these driers give rise to rapid oxidation which usable. We have found, however, that organic 59 causes the films laid down from the composidons peroxides when used in conjunction with polym hydric alcohol-polybasic acid resins, as described below, yieldcoating compositions which dry in.

them are described in the following examples:

Example 1 Titanium dioxide 10.00 Lithopone I 36.00 Zinc oxide 10.00 15 Resin A 20.00 Mineral spirits 13.00 Benzoyl peroxide. 5.00

Example 2 Lithopone 40.00 Zinc oxide 8.90 25 -Resin A 1 30.80 Mineral spirits 13.80 Cobalt drier .04 Benzoyl peroxide 3.16

Example 3 Titanium dioxide 10.00 Lithopone 36.00 35 Zinc oxide 10.00 Resin A 26.00 Mineral spirits 13.00 Dibutyl peroxide 5.00

Example 4 Lithopone 43.3 Zinc oxide 10.9 45. Resin A 12.8 Oil I A 14.0 Benzoyl peroxide 5.2 Mineral spirits 13.8

Example 5 Lithop'one 43.3 Zinc oxide 10.9 5 Resin B 12.8 011 A 14.0 Benzoyl peroxide 3.0 Turpentine 16.0

In the last two examples we used a blend of oil soluble resin and bodied oil prepared in accordance with the method more fully set forth and claimed in copending application oi! John W. Ilifl and Paul Robinson, Serial No. 462,408, filed lwJune 19. 1930. This method of preparing the blendis characterized by the fact that oil soluble are prepared and these resins are dissolvedissue- 001a in the-bodied oil.

Thcoil designated A in Examples 4 and 5 was oiigkettle bodied in the absence or air at temperature of 525 F. to a viscosity of about poises'.

- Example 6 Lithopone"; 42.30 Lead chromate 1.00 Zinc oxide 8.90 Resin A Q 30.80 Mineral spirits 13.80 Cobalt drier .04 Benzoyl peroxide 3.16

Example 7 A clear lacquer unusually light in color and re- Jsistant to color changes can be made from the following ingredients:

Resin B 50.0 Acetone 48.5 Benzoyl peroxide 1.5

The compositions oi polyhydric alcohol-polybasic acid resin referred to in the above examples are as follows:v

These resins are preferably made by heating the drying or semi-drying oil with the glycerol or other polyhydric alcohols until the alcohol goes into the solution in the oil. The mixture of glycerides so formed is then heated with phthalic anhydride, or other polybasic acid, until esterificationv occurs.

Since the specific details of this method of making the resins forms no part of the present invention, attention is directed to the co-pending applicationot Paul Robinson, Serial No. 370,727, filed June 13, 1929, for a fuller disclosure thereof. It is understood, however, that the present invention is not limited to this particular method or making the resins but other processes known to those skilled in the art may be used."

It is to be understood that the benzoyl peroxide or dibutyl peroxide mentioned in the examples may be replaced by other organic peroxides such as dioleyl peroxide or dinitro dibenzoyl peroxide. Likewise, resins made with difierent polyhydric alcohols and polybasic acids, and with varying proportions thereof, may be used instead or the specific resins mentioned. It is desirable, however, in the practice of the present invention to keep the oil glyceride present in the resin from greatly exceeding 65% because the composition will then dry too slowly tobe satisfactory for most purposes unless it also contains considerable amounts of metallic driers. Other oils such as China-wood oil may be substituted for the linseed or "soya bean oil, although the advantages of the meant in this case are also not so apparent since the oil acids are dark colored.

It is to be understood that the term "oil modified polyhydric alcohol-polybasic acid resin mentioned in the claims refers to resins made by reacting, as indicated above, or in any suitable way, a fatty oil of the drying or semi-drying type, or the corresponding fatty oil acids, with a polybasic acidand a polyhydric alcohol.

As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that we do not limit ourselves to in the appended claims.

We claim: 1. A rapid drying coating composition compris= ing an oil modified polyhydric alcohol-polybasic acid resin and a drier for said composition which comprises a major proportion of an organic peroxide, said resin being selected from the class consisting of drying and semi-drying oil modified resins. 2; The composition set forth in claim 1 in which the organic peroxide is selected from the class consisting of benzoyl peroxide, dibutyl peroxide, dioleyl peroxide and dinitro dibenzoyl peroxide 3. The coating composition set forth in claim 1 in whichthe resin is a glyceryi phthalate resin.

PAUL ROBINSON. BEN E. SORENSON.