CYCLOALIPHATIC POLYPHOSPHITE

摘要

A polymeric polyphosphite and copolymeric polyphosphite is described which contains a cycloaliphatic moiety, preferably cyclohexane dimethanol, in the polyphosphite backbone chain. Incorporation of the polymeric polyphosphite into synthetic polymers reduces the yellowness index of any polymer into which the polymeric polyphosphite additive has been added, as well as increased hydrolytic stability as well as increased resistance to migration in food packaging.

主权项

1. A polymeric polyphosphite containing from 2 to 1000 repeating units of the formula: in which:
R2 is selected from the group consisting of
(i) a C1-20 alkyl group, a C2-22 alkenyl group,(ii) a C2-20 polyalkylene glycol chain, and(iii) a 3 to 7 membered ring containing a —CO—O— group;each of R7 and R9 independently represents a C1-6 alkylene group;R8 is selected from the group consisting of C5-10 saturated carbocyclic rings; anda and b are independently selected from the group consisting of 0 and 1;and from 0 to 1000 repeating units of the formula: in which:
Y is a C2-22 alkylene group,m ranges from 1 to 20;said polyphosphite being terminated adjacent the —P(OR2)— group of the formula above by a group R1O—, and terminated at the other end of the chain by a group —P(OR3)(OR4), in which each of R1, R3, and R4, which may be the same or different, has one of the meanings given for R2;provided that when said polyphosphite contains more than 1 but less than or equal to 12 units of Formula B, it must contain 2 or more units of Formula A; and furtherprovided that when said polyphosphite contains no units of Formula B, it must contain 8 or more units of Formula A.