Organophosphonate coester stabilizers
AssigneeArgus Chemical Corporation
InventorsMotonobu Minagawa, Yutaka Nakahara, Masayuki Takahashi
Life of this patent
Estimating the term…
Abstract
New polyhydric phenol coesters are disclosed of polyhydric phenols, having 2 to 3 phenolic hydroxyl groups and 1 to 3 benzenoid rings, with carbonic acid and an organophosphonic acid having linked to phosphorus as alkyl, aryl, aralkyl or alkaryl group optionally substituted with a phenolic hydroxyl group. The new coesters have molecular weights up to a maximum of about 10,000, preferably from 1000 to 9000, and are highly effective stabilizers for a variety of synthetic resins. Stabilizer compositions comprising a polyhydric phenol coester and a known polymer stabilizer, as well as synthetic resins stabilized with such stabilizer compositions, are also disclosed.
Claims16
As a new composition of matter, a coester having a molecular weight below 10,000, of at least one polyhydric phenol having 2 to 3 phenolic hydroxyl groups and 1 to 3 non-condensed benzenoid rings, with carbonic acid and an organophosphonic acid having the formula ##STR52## in which R is an alkyl, cycyloalkyl, aralkyl, aryl, or alkaryl group or the group --A--(OH).sub.m+1 ;
- X independently at each occurrance ##STR53## provided that at least one X is ##STR54## and at least one X is ##STR55## A is a residue of a dihydric or trihydric phenol;
- R' is a hydrogen atom or --X--O--R;
- R" is ##STR56## R.sub.1 is an alkyl group, R.sub.2 and R.sub.3 are hydrogen or alkyl,
- a is an integer from 1 to 8,
- m is zero or one, and n is an integer from 1 to 20.
Dependencies are inferred from the claim text.