Melt-stable recyclable carbon black-laden polyacetal resin molding compositions and molded articles formed of the same
US5212222A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1992 |
| Grant date | May 18, 1993 |
| Priority date | — |
| Expiry date | Jan 29, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Melt-stable polyacetal molding compositions include a polyacetal base resin, and a carbon black-impregnated ethylenic carrier polymer in amounts to yield between about 0.1 to 30 parts by weight of carbon black. The ethylenic carrier polymer is preferably present in an amount between 0.3 to 8 times by weight of the carbon black impregnated therewithin. The compositions of this invention further contain a co-stabilization package which includes a first stabilizer selected from nitrogen-containing compounds, fatty acid ester compounds, and metal-containing compounds which contain a hydroxide, an inorganic acid salt or a carboxylic acid salt of an alkali metal or an alkaline earth metal, and a second stabilizer which is a hindered phenolic compound. Preferably, the first and second stabilizers are each used in amounts between 0.01 to 5 parts by weight, based on 100 parts by weight of the polyacetal base resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.