US 4,132,552 AGranted

Dimensionally stable polyester film supports with subbing layer thereon

AssigneeAgfa-Gevaert

InventorsAugust J. Van Paesschen, Lucien J. Van Gossum, Jan J. Priem

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Abstract

A process is described for the manufacture of a dimensionally stable polyester film support carrying a primer coating for improving the adhesion thereto of subsequently applied coatings, which process comprises applying to an unstretched or only monoaxially stretched polyester film support a layer of a coating composition from an aqueous dispersion, drying said layer, stretching it biaxially or in a direction perpendicular to the said first stretching operation together with the polyester film support and heat-setting the polyester film, wherein said coating composition, before drying and heat-setting, comprises a mixture of: (A) 52 to 79% by weight of a copolymeric binder comprising 60 to 95% by weight of methyl methacrylate, 3 to 20% by weight of a divinyl or diallyl monomer, 0 to 30% by weight of a plasticizing vinyl monomer, and 0 to 5% by weight of an ethylenically unsaturated carboxylic acid, (B) 0.5 to 3% by weight of a water-insoluble wax-like material and/or of a water-insoluble polymer characterized by the presence of repeating units corresponding to the formula : ##STR1## wherein each of X, X.sup.1, X.sup.2, and X.sup.3 represents hydrogen or fluorine, or each of X, X.sup.1, and X.sup.2 represents hydrogen and X.sup.3 represents a methyl group, or X represents chlorine and each of X.sup.1, X.sup.2, and X.sup.3 represents fluorine, (C) 20 to 40% by weight of an external plasticizer, said external plasticizer being wholly or almost entirely eliminated from the coating composition during the heat-setting, and (D) 0 to 5% by weight of a hydrophilic polymer.

Claims21

Dependent claims

A process for the manufacture of a dimensionally stable polyester film support carrying a primer coating to be eventually covered in part by a subsequently applied coating and in part exposed uncovered, said primer coating being adapted to improve the adhesion thereto of said subsequently applied coating, while exhibiting desirable mechanical properties in the exposed areas thereof, which process comprises applying to an at most monoaxially stretched polyester film support a primer layer of a coating composition from an aqueous dispersion, drying said layer, stretching the coated support biaxially or in a direction perpendicular to the said first stretching operation together with the polyester film support and heat-setting the stretched, coated polyester film, wherein said coating composition, before drying and heat-setting, is a dispersion in water of a mixture consisting essentially of:

(A) 52 to 79% by weight of a copolymeric binder consisting essentially of 60 to 95% by weight of a methyl methacrylate, 3 to 20% by weight of a divinyl or diallyl monomer, 0 to 30% by weight of a plasticizing ethylenically unsaturated monomer, and 0 to 5% by weight of an ethylenically unsaturated carboxylic acid,
(B) 0.5 to 3% by weight of a water-insoluble waxy material having a melting point in the range of about 20.degree.-100.degree. C. and selected from vegetable waxes, insect waxes, animal waxes, mineral waxes, petroleum waxes, synthetic waxes, and wax-like longchain hydrocarbons, fatty saturated and unbranched acids and alcohols, and ethers and esters of substantially aliphatic monohydric alcohols and/or of a water-insoluble polymer consisting of repeating units corresponding to the formula:
##STR7## wherein each of X, X.sup.1, X.sup.2, and X.sup.3 represents hydrogen or fluorine, or each of X, X.sup.1, and X.sup.2 represents hydrogen and X.sup.3 represents a methyl group,
or X represents chlorine and each of X.sup.1, X.sup.2, and X.sup.3 represents fluorine,
(C) 20 to 40% by weight of an external plasticizer, said external plasticizer being wholly or almost entirely eliminated from the coating composition during the heat-setting and
(D) 0 to 5% by weight of a hydrophilic polymer.

3 more elements

A dimensionally stable polyester film support carrying a strongly adhered primer layer which is eventually in part covered by a subsequently applied layer and in part exposed uncovered, said layer having been applied to said support, while the latter is unstretched in at least one direction, from a dispersion in water of a mixture consisting essentially of:

(A) 52 to 79% by weight of a copolymeric binder consisting essentially of 60 to 95% by weight of a methyl methacrylate, 3 to 20% by weight of a divinyl or diallyl monomer, 0 to 30% by weight of a plasticizing ethylenically unsaturated monomer, and 0 to 5% by weight of an ethylenically unsaturated carboxylic acid,
(B) 0.5 to 3% by weight of a water-insoluble waxy material having a melting point in the range of about 20.degree.-100.degree. C. and selected from vegetable waxes, insect waxes, animal waxes, mineral waxes, petroleum waxes, synthetic waxes, and wax-like longchain hydrocarbons, fatty saturated and unbranched acids and alcohols, and ethers and esters of substantially aliphatic monohydric alcohols and/or of a water-insoluble polymer consisting of repeating units corresponding to the formula:
##STR8## wherein each of X, X.sup.1, X.sup.2, and X.sup.3 represents hydrogen or fluorine, or each of X, X.sup.1, and X.sup.2 represents hydrogen and X.sup.3 represents a methyl group,
or X represents chlorine and each of X.sup.1, X.sup.2, and X.sup.3 represents fluorine,
(C) 20 to 40% by weight of an external plasticizer, said external plasticizer being at least substantially eliminated from the coating composition during the heat-setting, and
(D) 0 to 5% by weight of a hydrophilic polymer,
after the application of which layer said coated support is dried, stretched as necessary to impart biaxial stretching thereto, and heat set whereby said copolymeric binder is cured and said external plasticizer at least substantially eliminated from said layer.

4 more elements

Dependencies are inferred from the claim text.