US3665055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerizable unsaturated polyester resin compositions and articles made therefrom
Assignee: JOHN A HATTON JR
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Filing: 1969-10-22
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Granted: 1972-05-23
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Expires: 1989-10-22
Abstract
Abstract Styrene-maleic anhydride copolymer is added to a polymerizable composition containing an unsaturated polyester resin and a vinyl monomeric material which is capable of reacting with the polyester resin to form a thermoset polymer. The composition can be molded into articles as it is polymerized. The articles have improved properties, including improved surface properties, due to the use of the styrene-maleic anhydride copolymer. Glass fibers, as well as other materials generally included in polymerizable polyester compositions can be used also. The composition can be used to prepare chemically thickened resin mats or prepregs which can be molded and cured into articles having improved properties, including improved surface and dimensional stability properties.
Inventors
- 👤 John A Hatton Jr
- 👤 John S Mcnally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:37
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
37 words
A composition according to claim 1 wherein said styrene-maleic anhydride copolymer comprises at least about 50 wt. percent styrene and wherein the molecular weight of said copolymer is within the range of about 2,000 to about 300,000.
Claim 2
Dependent Claim
25 words
A composition according to claim 2 wherein the molecular weight of said styrene-maleic anhydride copolymer is within the range of about 80,000 to about 200,000.
Claim 3
Dependent Claim
21 words
A composition according to claim 1 wherein said styrene-maleic anhydride copolymer comprises about 2 to about 15 wt. percent maleic anhydride.
Claim 4
Dependent Claim
88 words
A polymerizable composition comprising in the unreacted state: a. about 25 to about 65 wt. percent of an ethylenically unsaturated polyester resin prepared by reacting an ethylenically unsaturated dicarboxylic acid or anhydride thereof with a diol and capable of crosslinking with a vinyl monomer to form a thermoset polymer; b. about 30 to about 60 wt. percent of a vinyl monomer capable of crosslinking with said polyester resin to form said thermoset polymer; and c. about 5 to about 20 wt. percent of a thermoplastic styrene-maleic anhydride copolymer.
Claim 5
Dependent Claim
37 words
A composition according to claim 5 wherein said styrene-maleic anhydride copolymer comprises at least about 50 wt. percent styrene and wherein the molecular weight of said copolymer is within the range of about 2,000 to about 300,000.
Claim 6
Dependent Claim
25 words
A composition according to claim 6 wherein the molecular weight of said styrene-maleic anhydride copolymer is within the range of about 80,000 to about 200,000.
Claim 7
Dependent Claim
21 words
A composition according to claim 5 wherein said styrene-maleic anhydride copolymer comprises about 2 to about 15 wt. percent maleic anhydride.
Claim 8
Dependent Claim
64 words
A polymerizable composition comprising in the unreacted state: a. an ethylenically unsaturated polyester resin prepared by reacting an ethylenically unsaturated dicarboxylic acid or anhydride thereof with a diol and capable of crosslinking with a vinyl monomer to form a thermoset polymer; b. a vinyl monomer capable of crosslinking with said polyester resin to form said thermoset polymer; and c. a thermoplastic styrene-maleic anhydride copolymer.
Claim 9
Dependent Claim
79 words
A polymerizable composition comprising, in the unreacted state: a. about 25 to about 65 wt. percent of an unsaturated polyester resin prepared by reacting maleic anhydride and propylene glycol; b. about 30 to about 60 wt. percent of styrene; and c. about 5 to about 20 wt. percent of thermoplastic styrene-maleic anhydride copolymer having a molecular weight within the range of about 80,000 to about 200,000 and a maleic anhydride content of about 2 to about 15 wt. percent.
Claim 10
Dependent Claim
22 words
A composition according to claim 1 wherein said polyester resin and said styrene-maleic anhydride copolymer are each soluble in said vinyl monomer.
Claim 11
Dependent Claim
22 words
A composition according to claim 5 wherein said polyester resin and said styrene-maleic anhydride copolymer are each soluble in said vinyl monomer.
Claim 12
Dependent Claim
22 words
A composition according to claim 9 wherein said polyester resin and said styrene-maleic anhydride copolymer are each soluble in said vinyl monomer.
Claim 13
Dependent Claim
115 words
In the process for preparing thermoset polyester articles wherein a polymerizable composition comprising: a. an ethylenically unsaturated polyester prepared by reacting an ethylenically unsaturated dicarboxylic acid or anhydride thereof with a diol; b. a vinyl monomer capable of crosslinking with said polyester to form said thermoset article; and c. a thermoplastic polymer; is cured and molded into said article, and wherein said thermoplastic polymer improves the smoothness of the surface of said article, the improvement comprising incorporating into said polymerizable composition, while in the unreacted state, thermoplastic styrene-maleic anhydride copolymer in an amount sufficient to improve the smoothness of the surface of said article, and thereafter molding and curing said polymerizable composition into said article.
Claim 14
Dependent Claim
68 words
A process according to claim 14 wherein said styrene-maleic anhydride copolymer comprises at least about 50 wt. percent styrene, wherein the molecular weight of said copolymer is within the range of about 2,000 to about 300,000, wherein the amount of said copolymer in said polymerizable composition is about 3 to about 50 wt. percent and wherein said copolymer and said polyester are each soluble in said vinyl monomer.
Claim 15
Dependent Claim
61 words
A process according to claim 15 wherein the amount of maleic anhydride in said styrene-maleic anhydride copolymer is about 2 to about 15 wt. percent, wherein the molecular weight of said copolymer is within the range of about 80,000 to about 200,000 and wherein the amount of said copolymer in said polymerizable composition is about 5 to about 20 wt. percent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |