Back to results
US 4,316,006 AGranted
Polymeric phosphonates of a cyclic phosphite and epoxide
AssigneeThe Dow Chemical Company
InventorGerald K. McEwen
Life of this patent
Estimating the term…
Abstract
Phosphorus containing polymers are prepared by copolymerizing a cyclic phosphite and an epoxide in the presence of an acid catalyst. The resulting polymer can be incorporated within a thermoplastic or thermosettable resin to increase the flame resistivity thereof.
Claims20
A polymeric phosphonate of the formula:
- ##STR8## wherein x is an integer from 2 to 4;
- y and z are individually at least 1;
- R is individually hydrocarbyl or inertly substituted hydrocarbyl;
- each R' is individually hydrogen, hydrocarbyl or inertly substituted hydrocarbyl;
- each R" is hydrogen, hydrocarbyl, inertly substituted hydrocarbyl or a hydroxy containing group;
- B is the residue of an organic, active hydrogen initiator provided that if the active hydrogen initiator is an alkyl alcohol, it is a monohydric alcohol or an alkyl alcohol having three or more hydroxy groups;
- and a is an integer from 1 to the number of active hydrogens on the organic active hydrogen initiator.
4 more elements
A method for preparing a copolymeric phosphonate which method comprises the step of contacting a cyclic phosphite and an epoxide in the presence of an acid catalyst and under conditions sufficient to copolymerize the cyclic phosphite and epoxide.
Dependencies are inferred from the claim text.