Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1979-08-13
1981-07-28
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 63, 525 69, 525 91, 525365, 525386, C08L 6704, C08G 6310
Patent
active
042810876
ABSTRACT:
Block and graft lactone copolymers are prepared by reacting a base polymer containing hydroxyl groups with an organometallic catalyst of the formula ##STR1## wherein R.sub.1 ', R.sub.2 ', R.sub.3 ', and R.sub.4 ' are alkoxy groups (alcoholate groups), M' is a trivalent metal and M is a divalent metal, whereby the catalyst becomes bonded to the base polymer by way of the hydroxyl groups. Then the remaining alkoxy groups are converted to acyl groups and thereafter the organometalic end-groups are reacted with a lactone to form the lactone polymer moiety. The resulting block and graft copolymers are particularly useful when blended with other polymers, as for example polyvinyl chloride.
REFERENCES:
patent: 3432445 (1969-03-01), Osgan et al.
patent: 3585257 (1971-06-01), Mueller et al.
patent: 3598791 (1971-08-01), Nieuwenhuis et al.
patent: 3789084 (1974-01-01), Childers et al.
patent: 3855357 (1974-12-01), Harris et al.
patent: 3897513 (1975-07-01), Sundet
Heuschen Jean
Jerome Robert
Teyssie Philippe
Briggs Sr. Wilbert J.
Shust Nestor W.
Teyssie Philippe
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