Radiation process for preparing mixtures with building tack whic

Details Radiation process for preparing mixtures with building tack whic Radiation process for preparing mixtures with building tack whic

1978-09-11

1979-08-28

Turer, Richard B.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

20415918, 2041592, C08F 800, C08F 240

Patent

active

041660161

ABSTRACT:
A process for preparing a mixture based on a rubberlike copolymer of ethylene, at least one other alpha-alkene and one or more polyenes and tackifying resins which has good building tack.
This good building tack can be obtained if the copolymer contains C.dbd.C bonds positioned in the non linear part of the polymer chains, the carbon atoms of which C.dbd.C bonds either have two hydrocarbon groups which are in vicinal cis relative positions and which do not form part of the same cyclic system, or have at least three hydrocarbon groups. In order to obtain the desired high building tack value the mixture must show in unvulcanized state an elongation at break of at least 500% and a tensile strength lying between 1.5 and 50 kg/cm.sup.2. The mixture must be subjected to an artificial light source radiating light with a wave length of between 200 and 300 nm and impacting a radiated energy to the mixture of at least 2 microwatts/cm.sup.2 per nm in the presence of oxygen and a photosensitizer.

REFERENCES:
patent: 3616362 (1971-10-01), Soldatos
patent: 3840448 (1974-10-01), Osborn et al.
patent: 3846266 (1974-11-01), Duynstee
patent: 3860505 (1975-01-01), Tarney et al.
patent: 3990958 (1976-11-01), Sasse
patent: 4127461 (1978-11-01), Paulen
Rubber Age, "News Reports", pp. 61-65, Oct. 1, 1974.

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