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:
Apr. 07, 1981
Filed:
Oct. 10, 1978
Manfred Schmidt, Krefeld, DE;
Theo Kemperman, Cologne, DE;
Dieter Freitag, Krefeld, DE;
Hermann Fries, Berg. Gladbach, DE;
Erich Esch, Leverkusen, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
Resins having a softening point of from 50.degree. to 130.degree. C., an OH-number of from 250 to 400 and an iodine number of from 90 to 160, obtainable by reacting an alkyl phenol-formaldehyde novolak or an alkyl phenol mixture-formaldehyde novolak under acid-catalysed conditions with a polunuclear phenol or polynuclear phenol mixture and formaldehyde and/or an aliphatic aldehyde or aliphatic aldehyde mixture, the ratio by weight of the alkyl phenol or alkyl phenol mixture to the polynuclear phenol or polynyclear phenol mixture being from 2.2:1 to 1:10.