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:
Jul. 13, 1982
Filed:
Oct. 14, 1980
Gerhard Sprintschnik, Hofheim-Wallau, DE;
Rudolf Neubauer, Erbach, DE;
Gerhard Buhr, Konigstein, DE;
Hoechst Aktiengesellschaft, , DE;
Abstract
This invention relates to a developer mixture for washing out light-sensitive copying layers previously exposed in imagewise manner and containing a polymer of an N-vinyl amine, of vinyl alcohol or of a vinyl alcohol derivative, an alcohol being water-soluble in an amount less than 10% by weight, and water as the main constituent, the mixture containing as said polymer a copolymer which is water-soluble or which can be dispersed in water to form a stable dispersion, composed of (a) hydrophilic units of the formula I: ##STR1## wherein A is O-R or ##STR2## R is a hydrogen atom or a methyl group; R.sub.1 is a hydrogen atom, an alkyl group or an alkoxy alkyl group having 1 to 10 carbon atoms each or an aryl group with 6 to 10 carbon atoms; R.sub.2 is an alkyl group or an acyl group having 1 to 5 carbon atoms each, and wherein a homopolymer of the hydrophilic units is water-soluble and of (b) hydrophobic units of vinyl monomers whose homopolymer is water-insoluble and which have an aromatic or a long-chain aliphatic group as the substituent, the proportion of the hydrophobic units being sufficient to ensure that an 0.1% aqueous solution of said copolymer has a surface tension of not more than 50 mN/m and that the quantity of said copolymer is at least sufficient to emulsify any quantity of alcohol exceeding the solubility limit. The invention also relates to a process for developing exposed light-sensitive copying layers using said developer mixture.