US4332767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing thermoplastic resin molded articles
Assignee: Toray Industries Inc
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Filing: 1979-12-28
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Granted: 1982-06-01
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Expires: 1999-12-28
Abstract
Abstract A method for producing thermoplastic resin molded articles is disclosed. The method comprises heating a sheet comprising a crystalline thermoplastic resin, which is crosslinked to a degree of more than about 5%, to a temperature that is higher than the melting point of the crosslinked resin but below the decomposition temperature thereof. The thus pre-heated sheet is press-molded under a pressure of about 50-1,000 kg/cm2 by a pair of press mold dies, which are maintained at a temperature below the melting point of the crosslinked resin.
Inventors
- 👤 Minoru Kitanaka
- 👤 Zenji Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:57
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/002; B29C43/00; B29C43/006; B29C67/00; B29C67/0011; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2105/00; B29K2105/06; B29K2105/12; B29K2995/00; B29K2995/0037; B29K2995/004; B29K2995/0041
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
85 words
A method for producing thermoplastic resin molded articles which comprises heating a sheet of crystalline crosslinked polyamide or polyester resin, which is crosslinked to a degree of crosslinking of more than about 5% to a temperature higher than the melting point of said crosslinked resin and below the decomposition temperature of the same, transferring said heated sheet to a press mold and press molding said preheated sheet between a pair of press molds maintained at a temperature below the melting point of said crosslinked resin.
Claim 2
Independent Claim
85 words
A method for producing thermoplastic resin molded articles which comprises heating a sheet of crystalline crosslinked polyamide or polyester resin, which is crosslinked to a degree of crosslinking of more than about 5% to a temperature higher than the melting point of said crosslinked resin and below the decomposition temperature of the same, transferring said heated sheet to a press mold and press molding said preheated sheet between a pair of press molds maintained at a temperature below the melting point of said crosslinked resin.
Claim 3
Dependent Claim
11 words
A method according to claim 1, wherein said polyamide is poly-ε-caprolactam.
Claim 4
Dependent Claim
12 words
A method according to claim 1, wherein said polyamide is polyhexamethylene adipamide.
Claim 5
Dependent Claim
12 words
A method according to claim 1, wherein said polyester is polyethylene terephthalate.
Claim 6
Dependent Claim
12 words
A method according to claim 1, wherein said polyester is polybutylene terephthalate.
Claim 7
Dependent Claim
12 words
A method according to claim 1, wherein said crystalline resin is polyethylene.
Claim 8
Dependent Claim
12 words
A method according to claim 1, wherein said crystalline resin is polypropylene.
Claim 9
Dependent Claim
21 words
A method according to claim 1, wherein said crystalline resin is crosslinked to a degree of crosslinking of more than 30%.
Claim 10
Dependent Claim
19 words
A method according to claim 1, wherein said sheet has a thickness of about 0.2 to about 10 mm.
Claim 11
Dependent Claim
27 words
A method according to claim 1, wherein said sheet contains about 5 to about 60 volume percent of fibrous reinforcing agent having less than 25 mm length.
Claim 12
Dependent Claim
27 words
A method according to claim 1, wherein said sheet contains about 5 to about 60 volume percent of fibrous reinforcing agent having less than 15 mm length.
Claim 13
Dependent Claim
14 words
A method according to claim 10, wherein said fibrous reinforcing agent is glass fiber.
Claim 14
Dependent Claim
14 words
A method according to claim 10, wherein said fibrous reinforcing agent is carbon fiber.
Claim 15
Dependent Claim
28 words
A method according to claim 1, wherein the press-molding of the preheated sheet is carried out under a pressure of about 50 to about 1,000 kg/cm 2 .
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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |