Reinforced flame retardant polyester composition having non-drip characteristics
US4052360A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1977 |
| Grant date | Oct 4, 1977 |
| Priority date | — |
| Expiry date | Feb 14, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L79/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is disclosed a process for preparing reinforced flame retardant copolyester molding compositions having non-drip characteristics. This process comprises intimately mixing a reinforcing agent, a Group Vb metal-containing compound, and the molten reaction product of a copolyester and a polycarbodiimide. The copolyester comprises the reaction product of (a) an alkane diol (as defined), (b) terephthalic acid, isophthalic acid or a dialkyl ester thereof, and (c) a halogenated derivative of the bishydroxyethylether of p,p'-isopropylidenediphenol. The polycarbodiimide must both (a) be derived from at least one aromatic diisocyanate which is either unsubstituted or contains up to one methyl substituent on each aromatic ring, and (b) contains at least three carbodiimide units per polycarbodiimide molecule. The reinforced flame retardant copolyester molding resin composition prepared by this process may be readily molded to form three-dimensional shaped articles having satisfactory mechanical properties using conventional molding techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.