Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1986-11-25
1989-09-26
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...
2642102, 2642104, 2642106, 525342, C08F25502
Patent
active
048701360
ABSTRACT:
If ultra-high-molecular-weight polyethylene having an intrinsic viscosity (.eta.) of at least 5 dl/g is grafted with a silane compound in the presence of a radical initiator and extrusion-molded and the extrudate is impregnated with a silanol condensation catalyst after or during drawing and is then exposed to water to effect crosslinking, there is obtained a novel molecularly oriented molded articles in which increase of the melting temperature, which is not observed in conventional draw-molded or crosslinked molded articles of polyethylene, can be attained, and even if this molecularly oriented molded article is exposed to a temperature of 180.degree. C. for 10 minutes, the molded article is not fused but the shape is retained and even after this heat history, a high strength retention ratio can be maintained. In this draw-molded article, the adhesiveness and creep resistance are prominently improved while high elastic modulus and high tensile strength inherent to a draw-molded article of ultra-high-molecular-weight polyethylene are retained.
REFERENCES:
patent: 3646155 (1972-02-01), Scott
patent: 4136132 (1979-01-01), Poole
patent: 4422993 (1983-12-01), Smith et al.
patent: 4430383 (1984-02-01), Smith et al.
patent: 4545950 (1985-10-01), Motooka et al.
Mantoku Hitoshi
Yagi Kazuo
Briggs Sr. Wilbert J.
Mitsui Pertrochemical Industries, Ltd.
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