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Fully cured crosslinkable pressure sensitive adhesive materials and method of making same

  • US 3,920,877 A
  • Filed: 03/23/1973
  • Issued: 11/18/1975
  • Est. Priority Date: 07/01/1971
  • Status: Expired due to Term
First Claim
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1. A PRESSURE-SENSITIVE, NORMALLY TACKY ADHESIVE COMPRISING A SUBSTANTIALLY COMPLETELY CROSSLINKED OR CURED POLYTHIOETHER CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OF A LIQUID POLYENE CONTAINING AT LEAST TWO UNSATURATED CARBON TO CARBON BONDS PER MOLECULE AND A LIQUID POLYTHIOL CONTAINING AT LEAST TWO THIOL GROUPS PER MOLECULE AND THE TOTAL COMBINED FUNCTIONALITY OF THE UNSATURATED CARBON TO CARBON BONDS PER MOLECULE IN THE POLYENE AND THE THIOL GROUPS PER MOLECULE IN THE POLYTHIOL IS GREATER THAN FOUR, SAID POLYENE AND SAID POLYTHIOL BEING OF SUCH MOLECULAR WEIGHT THAT UPON COMPLETE CROSSLINKING THE POLYTHIOETHER HAS A THEORETICAL CROSSLINK DENSITY IN THE RANGE 0.001-0.230 MILLIEQUIVALENTS OF CROSSLINK SITES PER GRAM.

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