US5075393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thickened moulding compositions
Assignee: Scott Bader Co Ltd
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Filing: 1989-08-16
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Granted: 1991-12-24
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Expires: 2009-08-16
Abstract
Abstract A moulding composition comprises a fibrous reinforcement, an ethylenically unsaturated, essentially amorphous, polymer, a cross-linking agent copolymerizable therewith and, as a thickener and low profile/shrinkage control agent, a crystalline saturated polyester which (a) has a number average molecular weight of from 700-10,000 inclusive, (b) has a melting point within a range of from 50°-140° C. inclusive, and (c) is soluble in an equal weight of the cross-linking agent at 100° C. and yet insoluble therein at 30° C.
Inventors
- 👤 Stephen J. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:03
CPC Classifications
C; C08; C08L; C08L63/00; C08L63/10; C08F; C08F290/00; C08F290/08; C08F290/14; C08F290/147; C08F299/00; C08F299/02; C08F299/04; C08F299/0478; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
128 words
A moulding composition comprising a fibrous reinforcement, an ethylenically unsaturated, essentially amorphous polymer, a cross-linking agent copolymerizable therewith and, as a thickener and low profile/shrinkage control agent, a crystalline polyester containing no ethylenic unsaturation, the amorphous polymer being selected from ethylenically unsaturated polyesters, vinyl ester polymers and urethane acrylate polymers, and the crystalline polyester (a) having a number average molecular weight of from 800-4,000 exclusive, (b) having a melting point within a range of from 50°-140° C. inclusive, (c) being soluble in an equal weight of styrene at 100° C. and yet insoluble therein at 30° C., and (d) being present in the composition in an amount, by weight of the total weight of the amorphous polymer, cross-linking agent and crystalline polyester, of from 5 to 50% inclusive.
Claim 2
Dependent Claim
128 words
A moulding composition comprising a fibrous reinforcement, an ethylenically unsaturated, essentially amorphous polymer, a cross-linking agent copolymerizable therewith and, as a thickener and low profile/shrinkage control agent, a crystalline polyester containing no ethylenic unsaturation, the amorphous polymer being selected from ethylenically unsaturated polyesters, vinyl ester polymers and urethane acrylate polymers, and the crystalline polyester (a) having a number average molecular weight of from 800-4,000 exclusive, (b) having a melting point within a range of from 50°-140° C. inclusive, (c) being soluble in an equal weight of styrene at 100° C. and yet insoluble therein at 30° C., and (d) being present in the composition in an amount, by weight of the total weight of the amorphous polymer, cross-linking agent and crystalline polyester, of from 5 to 50% inclusive.
Claim 3
Dependent Claim
35 words
A moulding composition according to claim 1, wherein the crystalline polyester has a melt viscosity within a range of from 1 p (0.1 Pa.s) at 125° C. to 40 p (4 Pa.s) at 150° C.
Claim 4
Dependent Claim
19 words
A moulding composition according to claim 1, wherein the crystalline polyester has a melting point of from 60°-120° C.
Claim 5
Dependent Claim
19 words
A moulding composition according to claim 1, wherein the said amount of the crystalline polyester is from 10-40% inclusive.
Claim 6
Dependent Claim
31 words
A moulding composition according to claim 1, wherein the crystalline polyester has a glycol component derived from at least one of ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol and 1,4-cyclohexanedimethanol.
Claim 7
Dependent Claim
21 words
A moulding composition according to claim 1, wherein the crystalline polyester has a glycol component derived from at least two glycols.
Claim 8
Dependent Claim
38 words
A moulding composition according to claim 1, wherein the crystalline polyester has an acid component derived from at least one of adipic acid, succinic acid, azelaic acid, terephthalic acid and isophthalic acid, and reactive derivatives of said acids.
Claim 9
Dependent Claim
24 words
A moulding composition according to claim 1, wherein the crystalline polyester has an acid component derived from at least two saturated dibasic carboxylic acids.
Claim 10
Dependent Claim
15 words
A moulding composition according to claim 1, wherein the crosslinking agent is a vinyl monomer.
Claim 11
Dependent Claim
30 words
A moulding composition according to claim 9, wherein the vinyl monomer is selected from styrene, vinyl toluene, p-methyl styrene, chlorostyrene, t-butyl styrene, methyl methacrylate, a glycol diacrylate and diallyl phthalate.
Claim 12
Dependent Claim
13 words
A moulding composition according to claim 10, wherein the vinyl monomer is styrene.
Claim 13
Dependent Claim
13 words
A moulding composition according to claim 1, which is a sheet moulding compound.
Claim 14
Dependent Claim
12 words
A moulding composition according to claim 1, which additionally contains a filler.
Claim 15
Dependent Claim
18 words
A moulding composition according to claim 1, which contains, as an additional thickener, a crystalline ethylenically unsaturated polyester.
Claim 16
Dependent Claim
20 words
A moulding composition according to claim 1, which contains an additional agent selected from low profile and shrinkage control agents.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
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