US4165307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of molding resins
Assignee: DIC Corp
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Filing: 1977-04-11
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Granted: 1979-08-21
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Expires: 1997-04-11
Abstract
Abstract The present invention relates to a process for preparation of molding resins comprising heating and kneading an isocyanate prepolymer derived from a hydroxyl-terminated polymer and a polyfunctional isocyanate with a hydroxyl-terminated low-molecular-weight polybutylene terephthalate in the presence of reinforcing filler by means of an extruder.
Inventors
- 👤 Shioji Mizuno
- 👤 Toshinori Sugie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:13
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4213; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/183; C08K; C08K3/00; C08K3/01; C08K3/013; C08L; C08L1/00; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
135 words
A process for the preparation of molding resins comprising heating and kneading an isocyanate prepolymer derived from a hydroxyl-terminated polymer and a polyfunctional isocyanate, with a hydroxyl-terminated low-molecular-weight polybutylene terephthalate having an inherent viscosity as herein defined of 0.15 to 0.55 dl/g in the presence of a reinforcing filler by means of an extruder, the amount of said isocyanate prepolymer and said low-molecular-weight polybutylene terephthalate being such as to satisfy the following relationship: (A)/(B)=(A')/(0.1-3.0)×(B') wherein A is the amount of said low-molecular-weight polybutylene terephthalate, B is the amount of said isocyanate prepolymer, A' is the hydroxyl equivalent weight (the molecular weight of said low-molecular-weight polybutylene terephthalate per hydroxyl group) of said low molecular-weight-polybutylene terephthalate and B' is the isocyanate equivalent weight (the molecular weight of said isocyanate prepolymer per isocyanate group) of said isocyanate prepolymer.
Claim 2
Dependent Claim
135 words
A process for the preparation of molding resins comprising heating and kneading an isocyanate prepolymer derived from a hydroxyl-terminated polymer and a polyfunctional isocyanate, with a hydroxyl-terminated low-molecular-weight polybutylene terephthalate having an inherent viscosity as herein defined of 0.15 to 0.55 dl/g in the presence of a reinforcing filler by means of an extruder, the amount of said isocyanate prepolymer and said low-molecular-weight polybutylene terephthalate being such as to satisfy the following relationship: (A)/(B)=(A')/(0.1-3.0)×(B') wherein A is the amount of said low-molecular-weight polybutylene terephthalate, B is the amount of said isocyanate prepolymer, A' is the hydroxyl equivalent weight (the molecular weight of said low-molecular-weight polybutylene terephthalate per hydroxyl group) of said low molecular-weight-polybutylene terephthalate and B' is the isocyanate equivalent weight (the molecular weight of said isocyanate prepolymer per isocyanate group) of said isocyanate prepolymer.
Claim 3
Dependent Claim
20 words
A process for the preparation of molding resins according to claim 1 wherein the reinforcing filler is a glass fiber.
Claim 4
Dependent Claim
20 words
A process for the preparation of molding resins according to claim 1 wherein the reinforcing filler is an asbestos fiber.
Claim 5
Dependent Claim
20 words
A process for the preparation of molding resins according to claim 1 wherein the reinforcing filler is a synthetic fiber.
Claim 6
Dependent Claim
27 words
A process for the preparation of molding resins according to claim 1 wherein the hydroxyl-terminated polymer has a number average molecular weight of from 100 to 10,000.
Claim 7
Dependent Claim
27 words
A process for the preparation of molding resins according to claim 1 wherein the hydroxyl-terminated low-molecular-weight polybutylene terephthalate has a hydroxyl value of from 5 to 40.
Claim 8
Dependent Claim
36 words
A process for the preparation of molding resins according to claim 1 wherein the kneading by the extruder is carried out at a temperature of from 150° to 300° C., for from 0.2 to 10 minutes.
Claim 9
Dependent Claim
28 words
A process for the preparation of molding resins according to claim 1 wherein the resulting molding resin is obtained in the form of pellets molded by the extruder.
Claim 10
Dependent Claim
18 words
A molded article prepared from a molding resin formed according to the process set forth in claim 1.
Claim 11
Dependent Claim
23 words
A process for the preparation of molding resins according to claim 5, wherein the number average molecular weight is from 200 to 5,000.
Claim 12
Dependent Claim
21 words
A process for the preparation of molding resins according to claim 6, wherein the hydroxyl value is from 7 to 15.
Claim 13
Dependent Claim
21 words
A process for the preparation of molding resins according to claim 7, wherein the temperature is from 180° to 260° C.
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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |