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:
Oct. 18, 1977
Filed:
May. 17, 1976
Bayer Aktiengesellschaft, Leverkusen, DT;
Abstract
The present invention relates to an interfacial process for the production of polycarbonates having terminal, aliphatically bonded hydroxyl groups by reacting predominantly dihydric alcohols with phosgene or chlorocarbonic acid esters of predominantly dihydric alcohols and/or phenols using alkali liquors as HCl-binding agents and in the presence of inert solvents, the process according to the invention being distinguished by the fact that concentrated, aqueous alkali liquors are used as the HCl-binding agents and thiodiglycol, optionally mixed with additional monohydric and polyhydric alcohols, is used as the dihydric alcohol. The present invention further relates to the new polycarbonates produced according to the novel process and to the use of these new polycarbonates for the production of polyurethane plastics.