Claims
- 1. A process for the preparation of a single-layered or multilayered molded article comprising shaping a mixture under conditions of heat and pressure, said mixture comprising:
- i) quasi-thermoplastic particles of a polyisocyanate-polyaddition product prepared by reacting, in a single stage or multistage process at an isocyanate index of from about 60 to about 140,
- (a) an aliphatic, cycloaliphatic, or aromatic polyisocyanate;
- (b) a compound having a molecular weight of from 1800 to 12,000, and containing on statistical average at least 2.4 isocyanate-reactive groups;
- (c) at least 5% by weight, based upon the weight of component (b), of a compound selected from the group consisting of:
- (1) diamines having molecular weights of from 108 to 400 and having primary aromatically bound amino groups and/or secondary aromatically bound amino groups, and
- (2) non-aromatic compounds having molecular weights of from 60 to 1799 and containing at least two isocyanate-reactive groups,
- with the proviso that the amounts and types of components (b) and (c) are such that the molar ratio of urea groups to urethane groups in said polyisocyanate-polyaddition product is at least 2:1, and
- (ii) one or more processing auxiliaries selected from the group consisting of solvents that swell the surface of said polyisocyanate-poly-addition product, compounds that undergo an addition or condensation reaction with said polyisocyanate-polyaddition product, radical formers, and thermoplastic materials that can be processed under the conditions of the process.
- 2. The process of claim 1 wherein the shaping is carried out at a pressure of at least 5 bar.
- 3. The process of claim 2 wherein the shaping is carried out at a pressure of from 50 to 400 bar.
- 4. The process of claim 1 wherein the shaping is carried out at a temperature of at least 50.degree. C.
- 5. The process of claim 4 wherein the shaping is carried out at a temperature of from 50.degree. to 200.degree. C.
- 6. The process of claim 1 wherein the shaping is carried out at a pressure of from 50 to 400 bar and at a temperature of from 50.degree. to 200.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
38 40 167.3 |
Nov 1988 |
DEX |
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CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. application Ser. No. 08/187,958, filed on Jan. 28, 1994, now abandoned which in turn was a continuation-in-part of U.S. application Ser. No. 08/168,698, filed on Dec. 16, 1993, now abandoned, which in turn was a continuation of U.S. application Ser. No. 07/436,529, filed on Nov. 14, 1989, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (5)
Number |
Date |
Country |
81701 |
Jun 1983 |
EPX |
2622951 |
Nov 1977 |
DEX |
3132760 |
Mar 1983 |
DEX |
3733756 |
Apr 1989 |
DEX |
3809524 |
Oct 1989 |
DEX |
Non-Patent Literature Citations (2)
Entry |
Macosko, C. W. Fundamentals of Reaction Injection Molding. New York, 1989, pp. 1-72. |
Becker/Braun, Kunststoffhandbuch, vol. 7, 1983, pp. 405-417. |
Continuations (1)
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Number |
Date |
Country |
Parent |
436529 |
Nov 1989 |
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Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
187958 |
Jan 1994 |
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Parent |
168698 |
Dec 1993 |
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