Method for the surface modification of objects made of polyvinylidene fluoride
First Claim
1. Method for the surface modification of objects made of polyvinylidene fluoride, especially for achieving bonding and hydrophilizing properties and for the producton of composite structures, comprising dehydrofluorinating the surface of the objects with an etching solution which contains one or more alkali metal alcoholates and/or alkali metal hydroxides and one or more swelling agent and/or solvent for polyvinylidene fluoride and at least one auxiliary agent for the homogenization and stabilization acting at the same time as a solubilizer for the alcoholate and the hydroxide, the auxiliary agent being a compound of the formula:
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space="preserve" listing-type="equation">A--(CR.sub.2)n--S--[(CR.sub.2)n--X--]m(CR.sub.2)n--Bwherein A and B, which can be either identical or different, represent an OR or NR2 group;
X is an oxygen atom or an NR group;
R residues, which can be either identical or different, represent a hydrogen atom or an alkyl group with 1 to 6 carbon atoms;
n is an integer of 1 to 6; and
m is an integer of 0 to 50.
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Accused Products
Abstract
A method for the surface modification of objects made from polyvinylidene fluoride by dehydrofluorinated of the surface of the objects. The dehydrofluorination is carried out with an etching solution which, in addition to a strong basic compound and a swelling agent and/or solvent for polyvinylidene fluoride, contains an auxiliary agent for the homogenization of the etching solution. The effect of etching is supported by an adhesion promoter. High resistance to shearing and good tough-elasticity in composite structure and laminates is achieved.
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Citations
10 Claims
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1. Method for the surface modification of objects made of polyvinylidene fluoride, especially for achieving bonding and hydrophilizing properties and for the producton of composite structures, comprising dehydrofluorinating the surface of the objects with an etching solution which contains one or more alkali metal alcoholates and/or alkali metal hydroxides and one or more swelling agent and/or solvent for polyvinylidene fluoride and at least one auxiliary agent for the homogenization and stabilization acting at the same time as a solubilizer for the alcoholate and the hydroxide, the auxiliary agent being a compound of the formula:
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space="preserve" listing-type="equation">A--(CR.sub.2)n--S--[(CR.sub.2)n--X--]m(CR.sub.2)n--Bwherein A and B, which can be either identical or different, represent an OR or NR2 group;
X is an oxygen atom or an NR group;
R residues, which can be either identical or different, represent a hydrogen atom or an alkyl group with 1 to 6 carbon atoms;
n is an integer of 1 to 6; and
m is an integer of 0 to 50. - View Dependent Claims (2, 3, 4, 8, 9, 10)
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- 5. Method for the surface modification of objects made of polyvinylidene fluoride, especially for achieving bonding and hydrophilizing properties and for the production of composite structures, comprising dehydrofluorinating the surface of the objects with an etching solution which contains one or more alkali metal alcoholate and/or alkali metal hydroxide and one or more swelling agent and/or solvent for polyvinylidene fluoride and at least one auxiliary agent for the homogenization and stabilization acting at the same time as a solubilizer for the alcoholate and the hydroxide, the auxiliary agent being a cyclic, straight-chain or branched, saturated, if necessary completely or partially fluorinated, polyhydric alcohol having 1 to 12 carbon atoms.
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7. Method for the surface modification of objects made of polyvinylidene fluoride, especially for achieving bonding and hydrophilizing properties and for the production of composite structures, comprising dehydrofluorinating the surface of the objects with an etching solution which contains one or more alkali metal alcoholate and/or alkali metal hydroxide and one or more swelling agent and/or solvent for polyvinylidene fluoride and at least one auxiliary agent for the homogenization and stabilization acting at the same time as a solubilizer for the alcoholate and the hydroxide, the auxiliary agent being a cylic, straight-chain or branched, saturated monohydrid alcohol having 3 to 12 carbon atoms, whereby as said one or more swelling agent and/or solvent N-methylpyrrolidone, hexamethyl phosphoric triamide and/or 1,3-dimethyl-3,4,5-tetrahydro-2(1H)-pyrimidinone is used.
Specification