The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 1993
Filed:
Feb. 20, 1990
Yohzoh Yamamoto, Yamaguchi, JP;
Takasi Nakagawa, Yamaguchi, JP;
Mitsui Petrochemical Industries, Ltd., Tokyo, JP;
Abstract
A sheet or a film composed of at least one cyclo-olefin polymer selected from the group consisting of ring-opened polymers derived from at least one cyclo-olefin of formula (I) ##STR1## wherein R.sup.1 to R.sup.12, independently from each other, represent a member selected from the class consisting of a hydrogen atom, halogen atoms and hydrocarbon groups; two of R.sup.9 to R.sup.12 may be linked to each other together with the carbon atoms to which they are bonded to form a monocyclic or polycyclic group which may contain a double bond; R.sup.9 and R.sup.10, or R.sup.11 and R.sup.12 may each form an alkylidene group together with the carbon atoms to which they are bonded; and n is 0 or a positive integer, ring-opened copolymers derived from the cyclo-olefins of formula (I), hydrogenation products of said polymer or copolymers and addition polymers of the cyclo-olefins of formula (I) with ethylene, said cyclo-olefin polymer having an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of 0.01 to 10 dl/g and a softening temperature of at least 70.degree. C.