US4431600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion molding of polyamidoimide resins
Assignee: Mitsubishi Chemical Corp
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Filing: 1982-01-19
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Granted: 1984-02-14
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Expires: 2002-01-19
Abstract
Abstract A process for extrusion molding a polyamidoimide resin comprising: feeding a polyamidoimide molding material in a granular solid or powder form into an extruder; then simultaneously compressing and melting the polyamidoimide molding material under a pressure of about 300 kg/cm2 or more by heating it to a temperature between the melting point and the decomposition temperature of the polyamidoimide resin; and next introducing the molten polyamidoimide molding material into a die such that the molten material is shaped to a desired form, solidified in the die, and is extruded from the die in a solidified form.
Inventors
- 👤 Kunisuke Sakamoto
- 👤 Junichi Yoshimura
- 👤 Isamu Shiga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:36
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/501; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92514; B29C2948/92704; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92895; B29C48/022; B29C48/03; B29C48/06; B29C48/09; B29C48/395; B29C48/397; B29C48/68; B29C48/681; B29C48/685; B29C48/686; B29K; B29K2077/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A process for extrusion molding a polyamidoimide resin comprising: (1) feeding a polyamidoimide molding material in a granular solid or powder form into an extruder; (2) compressing the polyamidoimide molding material under a pressure of about 300 kg/cm 2 or more in the extruder and simultaneously melting the material by heating it to a temperature between the melting point and the decomposition temperature of the polyamidoimide resin; and (3) introducing the molten polyamidoimide molding material maintained at the same temperature and pressure as in (2) into a die, and extruding therefrom such that the molten material is shaped to a desired form and solidified in the die, and is extruded from the die in solidified form.
Claim 2
Dependent Claim
116 words
A process for extrusion molding a polyamidoimide resin comprising: (1) feeding a polyamidoimide molding material in a granular solid or powder form into an extruder; (2) compressing the polyamidoimide molding material under a pressure of about 300 kg/cm 2 or more in the extruder and simultaneously melting the material by heating it to a temperature between the melting point and the decomposition temperature of the polyamidoimide resin; and (3) introducing the molten polyamidoimide molding material maintained at the same temperature and pressure as in (2) into a die, and extruding therefrom such that the molten material is shaped to a desired form and solidified in the die, and is extruded from the die in solidified form.
Claim 3
Dependent Claim
45 words
A process as in claim 1, wherein a major proportion of the polyamidoimide resin comprises a repeating structural unit represented by the formula ##STR5## wherein Ar is a trivalent aromatic group containing therein at least one benzene nucleus, and R is a divalent organic group.
Claim 4
Dependent Claim
24 words
A process as in claim 2, wherein a major proportion of the polyamidoimide resin comprises a repeating structural unit represented by the formula ##STR6##
Claim 5
Dependent Claim
22 words
A process as in claim 1, 2, or 3, wherein the pressure in (2) is from 400 to 1,200 kg/cm 2 .
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |