Production of an improved polyoxymethylene molding composition which forms reduced mold deposits upon molding
US4130604A · kind A · utility
4Cited by
5References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1977 |
| Grant date | Dec 19, 1978 |
| Priority date | — |
| Expiry date | Oct 28, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L69/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The mold deposit problem commonly associated with polyoxymethylene molding compositions which creates a non-uniform surface on a molded article effectively is minimized. The polyoxymethylene polymer initially is heated (as described) while in admixture with about 1 to about 4 percent by weight based upon the weight of the oxymethylene polymer of an aromatic polycarbonate (as defined). In a preferred embodiment a minor quantity of malonamide also is admixed with polyoxymethylene polymer and the aromatic polycarbonate during heating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.