US3711432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low shrink polyester resin systems formed of a mixture of unsaturated polyester resin, monomeric copolymerizable component and cellulose organic ester
Assignee: WR Grace and Co Conn
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Filing: 1971-03-02
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Granted: 1973-01-16
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Expires: 1991-03-02
Abstract
Abstract The invention disclosed is for a method of preparing a new low shrink, one component polyester resin system which may be used in either bulk or sheet molding compounds. It may also be used in liquid form, at ambient or elevated temperatures, in casting or molding techniques of the polyester resin art. The one component polyester resin system consists of a mixture of unsaturated polyester resin, monomeric copolymerizable component and cellulose organic ester. Optional materials such as fillers, glass fibers, pigments, release agents, catalysts and the like may be added, according to the specific fabrication technique to be employed, to provide a system which displays little or no shrinkage during curing.
Inventors
- 👤 N Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:50
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
14 words
The resin system of claim 1 wherein the molecular weight is 15,000 to 500,000.
Claim 2
Dependent Claim
13 words
The resin system of claim 1 wherein the monomeric copolymerizable component is styrene.
Claim 3
Dependent Claim
38 words
The resin system of claim 1 having therein an effective amount of a polymerization initiator whereby upon curing of the resinous system, surfaces are characterized as smooth, free of ripple and shrink marks, with excellent adhesion to paints.
Claim 4
Dependent Claim
35 words
The resin system of claim 1 wherein the Alpha , Beta -unsaturated dicarboxylic acid is selected from the group consisting of maleic acid, maleic anhydride, fumaric acid, itaconia acid, citraconic, mesaconic acid and aconitic acid.
Claim 5
Dependent Claim
39 words
The resin system of claim 1 wherein the polyhydric alcohol is selected from the group consisting of ethylene glycol; propanediol-1;2 butanediol -1;3, butanediol -1;4 diethylene glycol; dipropylene glycol; neopentylglycol; 2,2,4 -trimethylpentanediol -1;3, oxalkylated bisphenols; hydrogenated bisphenol, and cyclohexane dimenthanol.
Claim 6
Dependent Claim
33 words
A cured product cured by exposing the resin system of claim 1 to a temperature from about 212*F. to about 350*F. and pressures in the range from about 100 to about 1,500 psi.
Claim 7
Independent Claim
158 words
A method for preparation of a homogenous polyester resin system which comprises mixing together about 15 to about 45 parts by weight of a cellulose organic ester having a molecular weight from 10,000 to 1,000,000 and selecteD from the group consisting of cellulose propionate, cellulose acetate propionate, and cellulose acetate butyrate; which is added with agitation to about 55 to about 85 parts by weight of a monomeric copolymerizable component selected from the group consisting of styrene, vinyl toluene, divinyl benzene, methyl acrylate, ethyl acrylate, n-butyl acrylate, 2-ethyl hexyl acrylate, methyl methacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, trimethylolpropane, trimethacrylate, diallyl phthalate, diallyl maleate, diallyl fumarate, triallyl cyanurate, vinyl acetate and vinyl propionate; occluded in the system, and thereafter, adding from about 95 to about 125 parts by weight of unsaturated polyester resin solutions, the unsaturated polyester resin being the condensation product obtained by polycondensation of Alpha , Beta -unsaturated dicarboxylic acid and/or anhydrides together with polyhydric alcohol.
Claim 8
Dependent Claim
13 words
The method of claim 8 wherein the molecular weight is 15,000 to 500,000.
Claim 9
Dependent Claim
12 words
The method of claim 8 wherein the monomeric copolymerizable component is styrene.
Claim 10
Dependent Claim
40 words
The method for preparation of a resin system of claim 8 wherein the Alpha , Beta -unsaturated dicarboxylic acid is selected from the group consisting of maleic acid, maleic anhydride, fumaric acid, itaconia acid, citraconic, mesaconic acid and aconitic acid.
Claim 11
Dependent Claim
44 words
The method for preparation of a resin system of claim 8 wherein the polyhydric alcohol is selected from the group consisting of ethylene glycol; propanediol-1;2 butanediol -1;3, butanediol -1;4 diethylene glycol; dipropylene glycol; neopentylglycol; 2,2,4 -trimethylpentanediol -1;3, oxalkylated bisphenols; hydrogenated bisphenol, and cyclohexane dimenthanol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |