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. 17, 1986
Filed:
Apr. 02, 1981
Artur Reischl, Leverkusen, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
Polyaddition products containing urethane groups are produced by reacting an isocyanate group containing distillation residue with a compound having a molecular weight less than 600 containing at least two alcoholic hydroxyl groups. The distillation residue is obtained in the commercial production of tolylene diisocyanate. The distillation residue and hydroxyl compound are reacted in amounts such that the NCO/OH equivalent ratio is less than 1.5:1. The polyaddition reaction is carried out at a temperature in the range of 50.degree. to 220.degree. C. The reaction is carried out in a reaction screw extruder preferably having self-cleaning screw geometry. The polyaddition products are useful as molding compositions, reactive fillers and starting materials in the production of flame-resistant polyurethane plastics.