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Process for the production of laminates utilizing pre-treating followed by impregnation

  • US 3,897,588 A
  • Filed: 02/09/1973
  • Issued: 07/29/1975
  • Est. Priority Date: 02/12/1972
  • Status: Expired due to Term
First Claim
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1. A PROCESS FOR THE PRODUCTION OF LAMINATES COMPRISING THE STEPS OF:

  • PRE-TREATING GLASS-CELLULOSE SHEETS COMPOSED OF 20-70% BY WEIGHT OF CELLULOSIC FIBERS AND 30-80% BY WEIGHT OF GLASS FIBERS WITH AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF MELAMINE RESINS PREPARED FROM FORMALDEHYDE AND MELAMINE IN A MOLAR RATIO OF FROM 1 TO 6 IN THE PRESENCE OF AN ACID CATALYST, AND METHYLOL GROUP-RICH PHENOLIC RESINS PREPARED FROM FORMALDEHYDE AND PHENOL IN A MOLAR RATIO OF FROM 1.3 TO 3.0 IN THE PRESENCE OF AN ALKALI CATALYST, IMPREGNATING THE PRE-TREATED SHEETS WITH AN EPOXY RESIN, DRYING THE IMPREGNATED SHEETS TO FORM PREPREGS THEREOF, ARRANGING THE PREPREGS FOR LAMINATION, PLACING ON THE OUTERMOST ONES OF THE ARRANGED PREPREGS A GLASS FABRIC PREVIOUSLY TREATED WITH THE EPOXY RESIN AS USED IN THE IMPREGNATION STEP, AND LAMINATING THE ARRANGED PREPREGS WITH THE RESIN-TREATED GLASS FABRIC ON THE OUTERMOST PREPREGS TO PRODUCE THE LAMINATE.

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