Phosphorus-containing polyarylene ethers
AssigneeRohm Co., Ltd.
InventorsWerner Ude, Joachim Knebel
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Abstract
Branched phosphorus-containing polyarylene ethers comprising repeating units of the structure ##STR1## wherein q and z are 0 or 1; and m has an average value from 1 to 10, statistically alternating with branching points units of the structures ##STR2## p being an integer from 1 to 4, and methods for making such ethers by polycondensing appropriate aromatic bifunctional compounds in the presence of further condensable compounds having more than two reactive groups.
Claims16
A phosphorus-containing polyarylene ether having repeating units of the structure ##STR33## wherein R taken alone is hydrogen or R . . . R taken together are one of the groups R";
- R' is alkyl, chloroformethyl, or aryl;
- Ar is phenylene, naphthylene, or ##STR34## wherein R" is a covalent sngle bond, oxygen, sulfur, a sulfonyl, carbonyl, methylene, or isopropylidene bridge, or an organic groups having from 5 to 15 carbon atoms whose free valences emanate from quaternary carbon atoms;
- q is 0 or 1;
- m has an average value from 1 to 10;
- and
- z is 0 or 1,
- said ether further being branched and containing as branching points units of the structures ##STR35## which statistically alternate with said repeating units, R"' being an at least trivalent aliphatic or aromatic group, q being 0 or 1, and p being an integer from 1 to 4.
A method for making a phosphorus-containing polyarylene ether which comprises polycondensing a bifunctional compound which is a phosphine or phosphine oxide of the formula ##STR37## in the presence of 0.5 to 15 mole percent, of the number of moles of said bifunctional compound, of a polyfunctional compound which is a member selected from the group consisting of ##STR38## wherein R taken alone is hydrogen or R . . . R taken together are a covalent single bond, oxygen, sulfur, sulfonyl, carbonyl, methylene, isopropylidene, or an organic group having 5 to 15 carbon atoms whose free valences emanate from a quaternary carbon atom;
- R' is alkyl, chloromethyl, or aryl;
- X is halogen or hydroxy;
- q is 0 or 1;
- R"' is an at least trivalent aliphatic or aromatic group;
- and
- P is an integer from 1 to 4;
- said polycondensation proceeding at an elevated temperature and in the presence of an amount of alkali at least half-equivalent to the groups X, one-half of all X present in the system being halogen and the other half hydroxy.
Dependencies are inferred from the claim text.