Block copolymers containing olefin sulfur dioxide segments and p

Details Block copolymers containing olefin sulfur dioxide segments and p Block copolymers containing olefin sulfur dioxide segments and p

1974-11-06

1976-01-13

Griffin, Ronald W.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 465R, 260 465H, 260827, 260836, 260874, 260878B, 260887, 260897R, C08F 2800, C08G 7522

Patent

active

039323692

ABSTRACT:
The instant invention relates to novel block copolymers containing olefin sulfur-dioxide segments and a process for their preparation. The olefin of choice is a "strained" olefin thus capable of reaction with SO.sub.2 in the presence of radicals at very high rates. Examples of strained olefins include cyclopropene, cyclobutene, norbornene, and the derivatives thereof. The novel block copolymers are prepared by contacting the olefin and the sulfur dioxide with a polymer under conditions of shearing degradation whereby said polymer is broken down into radical-containing segments which subsequently combine with the olefin and sulfur dioxide to form the novel copolymers described above. The polymer may be selected from the group consisting of polyisobutylene, poly(ethylene oxide), ethylene-propylene copolymers, poly(propylene oxide), polybutadiene, polyisoprene, etc. A novel block polymer formed by this preferred process shows improved properties as compared to physical mixtures of said polymer and olefin-sulfur dioxide copolymers. For example, the novel polymers formed by the preferred process of the instant invention show higher moduli and may be plasticized to higher levels while retaining good physical properties.

REFERENCES:
patent: 2310605 (1943-02-01), Barnett
patent: 2522776 (1950-09-01), Busse
patent: 2593414 (1952-04-01), Crouch
patent: 2625525 (1953-01-01), Lynch
patent: 2991269 (1961-07-01), Nozaki
patent: 3242231 (1966-03-01), Graham et al.
patent: 3313785 (1967-04-01), Zutty
patent: 3563961 (1971-02-01), Pickle et al.
patent: 3817967 (1974-06-01), Mace et al.

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