Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
294 words
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 percent by weight, and water as the main constituent, the mixture containing 1 to 15 percent by weight of said alcohol and 0.5 to 10 percent by weight of said polymer, said polymer is 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 ##STR5## wherein A is O-R or ##STR6## R is a hydrogen atom or a methyl group, R 1 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, R 2 is an acyl group having 1 to 4 carbon atoms, a homopolymer of the hydrophilic units being 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 and which are derived from alkyl esters of unsaturated carboxylic acids having alkyl groups with 4 to 30 carbon atoms, from vinyl aromatic compounds or from vinyl esters of aliphatic carboxylic acids having 4 to 30 carbon atoms, the proportion of the hydrophobic units being sufficient to ensure that an 0.1 percent aqueous solution of said copolymer has a surface tension of not more than 50 mN/m, the quantity of said copolymer being at least sufficient to emulsify any quantity of alcohol exceeding the solubility limit and the upper limit being reached when the viscosity of said developer mixture has a viscosity value of 0.2 cm 2 /s at 25° C., measured by the Ubbelohde method.
Claim 2
Dependent Claim
294 words
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 percent by weight, and water as the main constituent, the mixture containing 1 to 15 percent by weight of said alcohol and 0.5 to 10 percent by weight of said polymer, said polymer is 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 ##STR5## wherein A is O-R or ##STR6## R is a hydrogen atom or a methyl group, R 1 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, R 2 is an acyl group having 1 to 4 carbon atoms, a homopolymer of the hydrophilic units being 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 and which are derived from alkyl esters of unsaturated carboxylic acids having alkyl groups with 4 to 30 carbon atoms, from vinyl aromatic compounds or from vinyl esters of aliphatic carboxylic acids having 4 to 30 carbon atoms, the proportion of the hydrophobic units being sufficient to ensure that an 0.1 percent aqueous solution of said copolymer has a surface tension of not more than 50 mN/m, the quantity of said copolymer being at least sufficient to emulsify any quantity of alcohol exceeding the solubility limit and the upper limit being reached when the viscosity of said developer mixture has a viscosity value of 0.2 cm 2 /s at 25° C., measured by the Ubbelohde method.
Claim 3
Dependent Claim
20 words
A developer mixture according to claim 1 which additionally contains 0.05 to 5% by weight of an ionic wetting agent.
Claim 4
Dependent Claim
18 words
A developer mixture according to claim 1 which additionally contains 0.1 to 10% by weight of a salt.
Claim 5
Dependent Claim
18 words
A developer mixture according to claim 1 which additionally contains 0.1 to 8% by weight of an acid.
Claim 6
Dependent Claim
46 words
A developer mixture according to claim 1 which additionally contains 0.1 to 10% by weight of a polyvalent alcohol which may be partially etherified or esterified and which is water-soluble to at least 10% by weight, or of a water-insoluble completely etherified or esterified polyvalent alcohol.