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:
Aug. 08, 1995
Filed:
Oct. 08, 1993
Michael-Joachim Brekner, Frankfurt am Main, DE;
Thomas Weller, Mainz, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
As starting materials for substrates for optical storage disks, cycloolefin copolymers (COC) are produced by a polymerization process in which the polymerization is terminated at a point in time at which the molar-mass distribution M.sub.w /M.sub.n is <2.0, or COC blends are produced which are composed of a first component having M.sub.w <30,000 g/mol and M.sub.w /M.sub.n .ltoreq.2, preferably <2, and a second component having M.sub.w >15,000 g/mol and M.sub.w /M.sub.n less than/equal to 4 and greater than/equal to 2. The substrate is produced by thermal deformation either of a single COC having a molar-mass distribution M.sub.w /M.sub.n of <2 or of a blend composed of such a COC and one or more COCs having a molar-mass distribution of 2.ltoreq.M.sub.w /M.sub.n <4 and M.sub.w of between 15,000 and 250,000 g/mol.