Heat activatable multi-component sheet material & process for making same
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United States of America Patent
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Mar 10, 1987
Issued Date -
N/A
app pub date -
May 20, 1985
filing date -
Apr 7, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a heat activatable adhesive formed from at least two components each in the form of discrete, flowable particles which are capable of adhering in abutment of one particle with another to provide an open structured, porous matrix. The adhesive may be in the form of a sheet formed by blending the particles of each component, applying the mechanical mixture to a supporting sheet, heating the mixture and supporting sheet to the temperature at which the material with the lowest tackifying temperature becomes tacky, applying pressure sufficient to partially flatten the largest particles to a degree such that their minimum dimension is substantially equivalent to the thickness of the layer formed on said support sheet and during or after said pressure application.
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