Patent US4402902A successfully refreshed from Google Patents.
US4402902A
Expired / Lapsed
US
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Method for molding glass-filled thermoplastic resins
Assignee: GE Chemicals Inc
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Filing: 1981-12-07
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Granted: 1983-09-06
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Expires: 2001-12-07
Abstract
Abstract Glass fiber reinforced thermoplastic resins comprising glass fiber, a thermoplastic resin and a copolymer of an ethylenically-unsaturated monomer and from about 1 to about 20 wt. % of copolymerizable functional monomer exhibit a marked improvement in impact properties when melt processed in screw-fed melt processing equipment such as a screw-fed injection molding machine using back-pressures in the range 0-100 psi.
Inventors
- 👤 John C. Falk
- 👤 Klementina F. Khait
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:27
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/12; B; B29; B29C; B29C45/00; B29C45/0005; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; C08L35/00; C08L35/06; C08L25/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A method for producing improved glass-filled thermoplastic resin articles comprising the steps of: providing a dry blend composition comprising a rigid thermoplastic monovinylidene resin, a glass reinforcing fiber and a copolymer of at least monovinylidene monomer selected from the group consisting of monovinyl aromatic compounds and acrylic compounds and from 1 to 20 wt.% of at least one ethylenically unsaturated monomer containing at least one functional radical selected from the group consisting of carbonyl radicals and epoxy radicals; and melt-processing said composition in screw-fed means for resin processing at a back pressure of from 0 to 100 psi.
Claim 2
Independent Claim
98 words
A method for producing improved glass-filled thermoplastic resin articles comprising the steps of: providing a dry blend composition comprising a rigid thermoplastic monovinylidene resin, a glass reinforcing fiber and a copolymer of at least monovinylidene monomer selected from the group consisting of monovinyl aromatic compounds and acrylic compounds and from 1 to 20 wt.% of at least one ethylenically unsaturated monomer containing at least one functional radical selected from the group consisting of carbonyl radicals and epoxy radicals; and melt-processing said composition in screw-fed means for resin processing at a back pressure of from 0 to 100 psi.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said ethylenically-unsaturated monomer is selected from the group consisting of maleic anhydride, glycidyl methacrylate and N-alkoxymethyl acrylamide.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein said screw-fed means is a screw-fed injection molding machine.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein said monovinylidene resin is selected from the group consisting of styrenic resins and acrylic resins.
Claim 6
Dependent Claim
35 words
The method of claim 1 wherein the monovinylidene resin is a styrenic resin selected from the group consisting of polystyrene, styrene-acrylonitrile copolymers, styrene-alpha methylstyrene-acrylonitrile copolymers, styrene-methyl methacrylate copolymers, styrene-maleic anhydride copolymers, and high impact polystyrene.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein said monovinylidene resin is polymethyl methacrylate.
Claim 8
Dependent Claim
11 words
The method of claim 1 further comprising a non-styrenic thermoplastic resin.
Claim 9
Dependent Claim
9 words
The method of claim 1 further comprising polyphenylene ether.
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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |