Patent US4290938A successfully refreshed from Google Patents.
US4290938A
Expired / Lapsed
US
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Thermosetting injection molding compound
Assignee: Toyobo Co Ltd
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Filing: 1980-01-04
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Granted: 1981-09-22
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Expires: 2000-01-04
Abstract
Abstract A thermosetting injection molding compound comprising a specific crystalline unsaturated polyester comprising (A) a crystalline unsaturated polyester of terephthalic acid/fumaric acid=5/5-1/9 by mol (acid component) and 1,4-butanediol/other glycol=7/3-10/0 (glycol component) and (B) a styrene type monomer and/or allyl type monomer, and having specific ranges of a viscosity, a melting point and an acid value, said crystalline unsaturated polyester resin being admixed with (C) a glass fiber and (D) other additives in a specific ratio. The thermosetting injection molding compound has no tackiness and has excellent flowability and mold filling properties and can give an excellent molded product having good appearance without flow marks, surge or the like, and hence, the thermosetting injection molding compound of the present invention is particularly suitable for the preparation of electric, electronic and automobile parts which require excellent heat resistance, electrical characteristics and fire retardant properties.
Inventors
- 👤 Hideo Miyake
- 👤 Junichi Sakamoto
- 👤 Masakazu Sawaki
- 👤 Mamoru Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:02
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08G63/66; C08G63/668; C08G63/676; C08K; C08K3/00; C08K3/40; C08K7/00; C08K7/02; C08K7/04; C08K7/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
172 words
A thermosetting injection molding compound which comprises (A) crystalline unsaturated polyester which comprises (A) a crystalline unsaturated polyester consisting of acid components: terephthalic acid/fumaric acid=5/5 to 1/9 by mol and glycol components: 1,4-butanediol/other glycol=7/3 to 10/0 by mol, and having a Gardner-holdt bubble viscosity of N to W (measured in a 70% by weight solution in tetrachloroethane at 25° C.), a melting point of 50° to 130° C. and an acid value of not more than 20, and (B) at least one monomer selected from the group consisting of a styrene type monomer and an allyl type monomer; (C) a glass fiber; and (D) an additive selected from the group consisting of a filling agent, a fire retardant agent, a releasing agent, a colorant, a polymerization initiator and a polymerization inhibitor; said components being incorporated in the ratios of B/(A+B)=5 to 40% by weight, C(A+B+C+D)=5 to 30% by weight, and (C+D)/(A+B)=90/10 to 40/60 by weight; and said molding compound having an extension in a disc flow test of 80 to 110 mm.
Claim 2
Dependent Claim
172 words
A thermosetting injection molding compound which comprises (A) crystalline unsaturated polyester which comprises (A) a crystalline unsaturated polyester consisting of acid components: terephthalic acid/fumaric acid=5/5 to 1/9 by mol and glycol components: 1,4-butanediol/other glycol=7/3 to 10/0 by mol, and having a Gardner-holdt bubble viscosity of N to W (measured in a 70% by weight solution in tetrachloroethane at 25° C.), a melting point of 50° to 130° C. and an acid value of not more than 20, and (B) at least one monomer selected from the group consisting of a styrene type monomer and an allyl type monomer; (C) a glass fiber; and (D) an additive selected from the group consisting of a filling agent, a fire retardant agent, a releasing agent, a colorant, a polymerization initiator and a polymerization inhibitor; said components being incorporated in the ratios of B/(A+B)=5 to 40% by weight, C(A+B+C+D)=5 to 30% by weight, and (C+D)/(A+B)=90/10 to 40/60 by weight; and said molding compound having an extension in a disc flow test of 80 to 110 mm.
Claim 3
Dependent Claim
51 words
A thermosetting injection molding compound according to claim 1, wherein the acid components of the crystalline unsaturated polyester are terephthalic acid and fumaric acid in the ratio of 4/6 to 2/8 by mol and the glycol components are 1,4-butanediol and other glycol in the ratio of 8/2 to 9.5/0.5 by mol.
Claim 4
Dependent Claim
49 words
A thermosetting injection molding compound according to claim 2, wherein the other glycol is a member selected from the group consisting of ethylene glycol, propylene glycol, neopentyl glycol, diethylene glycol, dipropylene glycol, 2,2,4-trimethyl-1,3-pentanediol, 1,5-pentanediol, 1,6-hexanediol, 2,2-dimethyl-3-hydroxypropyl 2,2-dimethyl-3-hydroxypropionate, hydrogenated bisphenol A, and bisphenol A ethylene oxide or propylene oxide adduct.
Claim 5
Dependent Claim
29 words
A thermosetting injection molding compound according to claim 3, wherein the other glycol is a member selected from the group consisting of propylene glycol, neopentyl glycol and dipropylene glycol.
Claim 6
Dependent Claim
36 words
A thermosetting injection molding compound according to claim 1, wherein the monomer (B) is a member selected from the group consisting of styrene, vinyltoluene, chlorostyrene, bromostyrene, t-butylstyrene, α-methylstyrene, divinylbenzene, diallyl orthophthalate, diallyl isophthalate, and diallyl terephthalate.
Claim 7
Dependent Claim
37 words
A thermosetting injection molding compound according to claim 1, wherein the monomer (B) is incorporated in an amount of 10 to 35 parts by weight per 100 parts by weight of the crystalline unsaturated polyester resin (A+B).
Claim 8
Dependent Claim
35 words
A thermosetting injection molding compound according to claim 1, wherein the glass fiber (C) is incorporated in an amount of 8 to 25% by weight based on the total weight of the molding compound (A+B+C+D).
Claim 9
Dependent Claim
29 words
A thermosetting injection molding compound according to claim 1, wherein the glass fiber (C) and other additive (D) are incorporated in the range of (C+D)/(A+B)=85/15 to 45/55 by weight.
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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |