US4026965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated polyester with thermoplastic grafts using calcium hydroxide as gelling agent
Assignee: Owens Corning
•
Filing: 1976-08-27
•
Granted: 1977-05-31
•
Expires: 1996-08-27
Abstract
Abstract Low pressure molding compounds comprising a thermosetting resin and a thermoplastic resin are gelled with calcium hydroxide within a specific concentration range to produce compounds moldable at low pressures.
Inventors
- 👤 Michael G. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:06
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L; C08L51/00; C08L51/04; C08L67/00; C08L67/02; C08L67/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A method of producing a molded composition comprising: (a) forming a mixture of an unsaturated, crosslinkable thermosetting resin, an ethlenically unsaturated first monomer and a thermoplastic resin soluble in said first monomer, said thermoplastic resin comprising the reaction product of a second monomer with a mixture comprising a styrene-butadiene copolymer and a polybutadiene polymer, said second monomer being reacted with both said styrene-butadiene copolymer and said polybutadiene polymer; (b) aging said mixture in contact with a gelling agent consisting essentially of calcium hydroxide or magnesium hydroxide in an amount sufficient to gell said composition to a viscosity at which said composition is moldable, and, (c) molding said mixture to produce a molded composition.
Claim 2
Independent Claim
113 words
A method of producing a molded composition comprising: (a) forming a mixture of an unsaturated, crosslinkable thermosetting resin, an ethlenically unsaturated first monomer and a thermoplastic resin soluble in said first monomer, said thermoplastic resin comprising the reaction product of a second monomer with a mixture comprising a styrene-butadiene copolymer and a polybutadiene polymer, said second monomer being reacted with both said styrene-butadiene copolymer and said polybutadiene polymer; (b) aging said mixture in contact with a gelling agent consisting essentially of calcium hydroxide or magnesium hydroxide in an amount sufficient to gell said composition to a viscosity at which said composition is moldable, and, (c) molding said mixture to produce a molded composition.
Claim 3
Dependent Claim
32 words
The method of claim 1 in which said gelling agent is present in an amount within the range of from about 0.7 to about 1.2 parts per hundred parts of total resin.
Claim 4
Dependent Claim
23 words
The method of claim 1 in which said viscosity is within the range of from about 4 million to about 12 million centipoises.
Claim 5
Dependent Claim
24 words
The method of claim 1 in which said pressure is within the range of from about 30 to about 250 pounds per square inch.
Claim 6
Dependent Claim
23 words
The method of claim 2 in which said viscosity is within the range of from about 4 million to about 12 million centipoises.
Claim 7
Dependent Claim
21 words
The method of claim 2 in which said pressure is within the range of from about 30 to about 250 pounds.
Claim 8
Dependent Claim
21 words
The method of claim 5 in which said pressure is within the range of from about 30 to about 250 pounds.
Claim 9
Dependent Claim
38 words
The method of claim 1 in which said thermosetting resin has an acid value within the range of from about 15 to about 45 and a molecular weight within the range of from about 1,500 to about 2,500.
Claim 10
Dependent Claim
32 words
The method of claim 8 in which said thermoplastic resin has an acid value up to about 3 and a molecular weight within the range of from about 80,000 to about 350,000.
References Cited (Backward Citations)
US2568331A
Cited
US3219604A
Cited
US3431320A
Cited
DE1943181A1
Cited
US3857812A
Cited
US3883612A
Cited
US3862064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |