Flameproofed polyester molding composition
AssigneeTicona LLC
InventorsHans-Jerg Kleiner, Winfried Budzinsky, Gunther Kirsch
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Abstract
Polyesters such as polyethylene terephthalate or polybutylene terephthalate are provided with a flame-retardant finish by addition of calcium salts or aluminum salts of phosphinic or diphosphinic acids.
Claims9
A polyethylene or terephthalate polybutylene terephthalate polyester molding composition comprising a phosphinic acid salt of the formula (I) ##STR2## wherein R.sub.1 and R.sub.2 are identical or different and represent C.sub.1 -C.sub.4 -alkyl, which is linear or branched;
- M represents calcium ion or aluminum ion;
- m is 2 or 3;
- in a flame retardant amount.
A method for the preparation of a flameproofed polyethylene terephthalate or polybutylene terephthalate polyester molding composition comprising the step of adding a phosphinic acid salt of the formula I as a flameproofing agent to said polyester molding composition ##STR3## wherein R.sub.1 and R.sup.2 are identical or different and represent C.sub.1 -C.sub.4 -alkyl, which is linear or branched;
- M represents calcium ion or aluminum ion;
- m is 2 or 3.
A method for the preparation of a flameproofed polyethylene terephthalate polyester molding composition comprising the step of adding a phosphinic acid salt of the formula I as a flameproofing agent to said polyester molding composition ##STR4## wherein R.sup.1 and R.sup.2 are identical or different and represent C.sub.1 -C.sub.4 -alkyl, which is linear or branched;
- M represents calcium ion or-aluminum ion;
- m is 2 or 3.
A method for the preparation of a flameproofed polybutylene terephthalate polyester molding composition comprising the step of adding a phosphinic acid salt of the formula I as a flameproofing agent for said polyester molding composition ##STR5## wherein R.sup.1 and R.sup.2 are identical or different and represent C.sub.1 -C.sub.4 -alkyl, which is linear or branched;
- M represents calcium ion or aluminum ion;
- m is 2 or 3.
Dependencies are inferred from the claim text.