Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-12-07
1989-07-11
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528 15, 528 29, 528137, 528152, 528232, 528246, 528236, 528237, 528241, 528242, C08G 8300
Patent
active
048473324
ABSTRACT:
Cyclic formals, other than trioxane, form macromers with an olefinically unsaturated alcohol which functions as a propagating species to form a macromer of polyformal having a molecular weight generally less than about 10,000. A cationically ring-openable ether may be used to provide a polyether spacer in the alkenyl alcohol so that the macromer of polyformal formed contains a polyether block. Thus, the polyformal macromer may have a acryloyl, allyl, or styryl head group. Macromers of polyformal block copolymers are formed sequentially by first forming the block of first formal and then without isolating the macromer so formed, sequentially polymerizing a second formal monomer to form the second formal block. A macromer of randon copolymer may be formed with one or more cyclic formals or a cyclic ether. Macromers of random copolymers may also be formed with formaldehyde or trioxane. After a macromer of polyformal is formed, it may be isolated and used as a propagating species to provide a block copolymer with a polyether or with another formal. A macromer of polyformal may also be used to copolymerize an olefinic monomer to yield comb or graft copolymers in whcih the macromer chains are pendant. An end-capped macromer of polyformal may be used to form nonhydrolyzable formal-siloxane block copolymers.
REFERENCES:
patent: 3595812 (1971-07-01), Bolton
patent: 3652465 (1972-03-01), Takakura
patent: 3848020 (1974-11-01), Burg
patent: 3883450 (1975-05-01), Burg
Lobo Alfred D.
Shust Nestor W.
The B. F. Goodrich Company
Welsh Maurice J.
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