Process for making an adhesive-filler polymer film composite
First Claim
1. A process of producing a composite adhesive material comprising:
- providing at least one layer of an expanded polytetrafluoroethylene film having a microstructure defined by nodes and fibrils, the film having an initial void volume and a mean flow pore size;
providing a mixture containing particulate filler and an adhesive resin, the particulate filler being a collection of individual particles, said collection containing a particle having a largest particle size which is the largest detectable particle in the collection, wherein a ratio of mean flow pore size to the largest particle size is at least about 2; and
imbibing said mixture into the voids of the film to provide an even distribution of the mixture throughout said composite.
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Accused Products
Abstract
A method of preparing an adhesive composite is provided where a expanded fluoropolymer having nodes and interconnected fibrils with a void volume formed from the node and interconnected fibril structure is at least partially filled with a paste formed from a thermoset or thermoplastic adhesive and a particulate inorganic filler, sufficient adhesive and filler are present to provide a composite containing between about 5 to about 40 volume percent expanded fluoropolymer; 5-85 volume percent inorganic filler; and 10-95 volume percent of adhesive and filler, the adhesive and filler being contained within the voids of the expanded fluoropolymer. In the composite, the ratio of the mean flow pore size of the expanded fluoropolymer to the largest particle size of the filler is at least about 2 and/or the ratio of the minimum pore size of the expanded fluoropolymer to the largest particle size of the filler is at least about 1.4 within the composite.
44 Citations
15 Claims
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1. A process of producing a composite adhesive material comprising:
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providing at least one layer of an expanded polytetrafluoroethylene film having a microstructure defined by nodes and fibrils, the film having an initial void volume and a mean flow pore size; providing a mixture containing particulate filler and an adhesive resin, the particulate filler being a collection of individual particles, said collection containing a particle having a largest particle size which is the largest detectable particle in the collection, wherein a ratio of mean flow pore size to the largest particle size is at least about 2; and imbibing said mixture into the voids of the film to provide an even distribution of the mixture throughout said composite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15)
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13. A process for producing a composite adhesive material comprising:
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providing at least one layer of an expanded polytetrafluoroethylene film having a microstructure defined by nodes and fibrils, an initial void volume and a minimum pore size; providing a mixture containing particulate filler and an adhesive resin, the particulate filler being a collection of individual particles, said collection containing a particle having a largest particle size which is the largest detectable particle in the collection, wherein a ratio of minimum pore size to largest particle size is about 1.4; and imbibing said mixture into the voids of said film to provide even distribution of the mixture throughout said composite. - View Dependent Claims (14)
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Specification