US3668178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated polyester resins admixed with cyclic ester polymers
Assignee: Union Carbide Corp
•
Filing: 1970-08-28
•
Granted: 1972-06-06
•
Expires: 1990-08-28
Abstract
Abstract The disclosure of this application is directed to unsaturated polyester compositions, containing a polymer of a cyclic ester having an average of at least one carboxyl group per molecule, which have particular utility in sheet molding applications to form thermoset articles characterized by excellent impact strength and by excellent surface properties such as excellent smoothness, excellent receptiveness to paints and excellent reproduction of the surface contours of the mold in which they are formed into shaped, thermoset articles.
Inventors
- 👤 Lowell R Comstock
- 👤 Percy L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:06
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/04; C08L67/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
133 words
A composition suitable for use in sheet molding applications comprising an unsaturated polyester, a polymerizable ethylenically unsaturated monomer in an amount of about 10 to about 60 percent by weight based on the combined weight of said monomer and said polyester, a thickener which is a Group I, II or IV metal oxide or hydroxide in an amount of about 0.5 to about 75 percent by weight based on the weight of said polyester and a polymer of a cyclic ester in an amount of about 1 to about 60 percent by weight based on the weight of said polyester, said polymer of a cyclic ester having an average of at least one carboxyl group per molecule, a reduced viscosity of at least about 0.1 and a basic recurring unit of the formula:
Claim 2
Dependent Claim
108 words
A composition as defined in claim 2 wherein: the ethylenically unsaturated monomer is present in an amount of about 20 to about 50 percent by weight based on the combined weight of said monomer and said polyester; the Group I, II or IV metal oxide or hydroxide is present in an amount of about 1 to about 5 percent by weight based on the weight of said polyester; and the polymer of a cyclic ester having an average of at least one carboxyl group per molecule is present in an amount of about 1 to about 40 percent by weight based on the weight of the said polyester.
Claim 3
Dependent Claim
35 words
A composition as defined in claim 2 wherein the polymer of a cyclic ester is characterized by repeating units one of which is defined in claim 2 and the other of which has the formula:
Claim 4
Dependent Claim
22 words
A composition as defined in claim 2 wherein the polymer of a cyclic ester has a basic recurring unit of the formula:
Claim 5
Dependent Claim
16 words
A composition as defined in claim 2 wherein the thickener is a Group II metal oxide.
Claim 6
Dependent Claim
16 words
A composition as defined in claim 2 wherein the thickener is a Group II metal hydroxide.
Claim 7
Dependent Claim
16 words
A composition as defined in claim 2 wherein the thickener is a Group IV metal oxide.
Claim 8
Dependent Claim
16 words
A composition as defined in claim 2 wherein the thickener is a Group IV metal hydroxide.
Claim 9
Dependent Claim
13 words
A composition as defined in claim 2 wherein the thickener is calcium hydroxide.
Claim 10
Dependent Claim
26 words
A composition as defined in claim 2 wherein the polymer of a cyclic ester has an average of one to about 10 carboxyl groups per molecule.
Claim 11
Dependent Claim
26 words
A composition as defined in claim 2 wherein the polymer of a cyclic ester has an average of one to about two carboxyl groups per molecule.
Claim 12
Dependent Claim
27 words
A composition as defined in claim 2 wherein the unsaturated polyester is a condensation reaction product of a polyol and an unsaturated polycarboxylic acid or anhydride thereof.
Claim 13
Dependent Claim
40 words
A composition as defined in claim 13 wherein the unsaturated polyester is a condensation reaction product of a polyol and an acid having the formula: CnH2n 2(COOH)2 wherein n is an integer having a value of 2 to 20 inclusive.
Claim 14
Dependent Claim
31 words
A composition as defined in claim 13 wherein the polyol has the formula: wherein the sum of m + n equals at least one, R1 and R2 are hydrogen or alkyl.
Claim 15
Dependent Claim
33 words
A composition as defined in claim 13 wherein the polyol has the formula: HO (CaH2aO xH wherein a has a value of at least one, x has a value of at least 2.
Claim 16
Dependent Claim
19 words
A composition as defined in claim 13 wherein the polyol is ethylene glycol and the acid is fumaric acid.
Claim 17
Dependent Claim
21 words
A composition as defined in claim 13 wherein the polyol is propylene glycol and the acid anhydride is maleic acid anhydride.
Claim 18
Dependent Claim
16 words
A composition as defined in claim 2 wherein the ethylenically unsaturated monomer is a vinyl monomer.
Claim 19
Dependent Claim
13 words
A composition as defined in claim 19 wherein the vinyl monomer is styrene.
Claim 20
Dependent Claim
16 words
A composition as defined in claim 2 wherein the thickener is a Group I metal oxide.
Claim 21
Dependent Claim
16 words
A composition as defined in claim 2 wherein the thickener is a Group I metal hydroxide.
Claim 22
Dependent Claim
12 words
A composition as defined in claim 2 containing a peroxide cross-linking agent.
Claim 23
Dependent Claim
10 words
The cured product of the composition defined in claim 23.
Claim 24
Dependent Claim
26 words
A composition as defined in claim 2 wherein the polymer of a cyclic ester has an average of more than one phthalic acid group per molecule.
References Cited (Backward Citations)
CA502328A
Cited
US2628209A
Cited
US2645626A
Cited
US2887461A
Cited
GB1127939A
Cited
US3432458A
Cited
US3465061A
Cited
US3431320A
Cited
US3549586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |