Injection molded parts having improved surface gloss
US5731367A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1997 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Feb 4, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a reaction injection molding process for preparing a molded product comprising reacting, at an isocyanate index of about 70 to about 130, PA1 (a) an organic polyisocyanate; PA1 (b) one or more isocyanate-reactive compounds containing at least two isocyanate-reactive groups; PA1 (c) about 0.5 to about 40% by weight, based on the weight of the molded product, of rigid microspheres, wherein at least 95% of said microspheres have a particle size range of about 10 .mu.m to about 400 .mu.m and a median diameter of at least 120 .mu.m, PA1 (d) optionally, an inert gas dissolved in at least one of components (a) or (b) in an amount sufficient to produce a molded product having a density that is at least 1% less than the density of a molded product prepared in the same manner without using an inert gas but which is at least 0.2 g/cm.sup.3 ; PA1 (e) 0 to 45% by weight, based upon the weight of the molded product, of a reinforcing filler other than rigid microspheres; and PA1 (f) optionally, a blowing agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.