Curable polymeric composition comprising natural or synthetic ru

Details Curable polymeric composition comprising natural or synthetic ru Curable polymeric composition comprising natural or synthetic ru

1980-02-19

1981-05-26

Jacobs, Lewis T.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

20415919, C08F 800

Patent

active

042696801

ABSTRACT:
Photopolymerizable compositions comprised of (I) novel polymers which are substantially comprised of the reaction products of (A) organic polyisocyanates and (B) organic compounds containing at least about two active hydrogen atoms per molecule, said polymers having been end-capped by reaction with (C) organic compounds containing exactly one active hydrogen atoms and said end-capped polymers having viscosities of from about 5 to about 70 stokes when measured as a 30% solution in a mixture of approximately equal parts of xylol, methyl ethyl ketone and ethylene glycol monomethyl ether, at 25.degree. C., (II) addition polymerization initiators activatable by actinic light, (III) addition polymerizable ethylenically unsaturated components capable of forming polymers by photoinitiated polymerization in the presence of the initiators, and (IV) a natural or synthetic rubber. The unsaturated components may be integral parts of the polymer's structure, or they may be separate compounds admixed with the polymers and initiators. Relief images, especially useful for printing, are prepared by exposure of a mass of the composition to a light source through, e.g., a transparency which has relatively opaque and relatively translucent areas, and subsequent development of the image by application of a developer composition.

REFERENCES:
patent: 3632557 (1972-01-01), Brode et al.
patent: 3752786 (1973-08-01), Rossitto et al.
patent: 3782961 (1974-01-01), Takahashi et al.
patent: 3864133 (1975-02-01), Hisamatsu et al.
patent: 3891523 (1975-06-01), Hisamatsu et al.

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