Regulation of the viscosity increase in chemically thickened unsaturated polyester formulations
Abstract
Abstract UNSATURATED POLYESTER COMPOSITIONS PARTICULARLY FOR USE IN THE PREPARATION OF BULK MOLDING COMPOUND AND SHEET MOLDING COMPOUND STOCKS WHICH ARE CHEMICALLY THICKENED PRIOR TO CURING, BY INCORPORATION THEREIN OF FROM 0.5 PART TO 10 PARTS, PER 100 PARTS OF THE RESIN STSTEM, OR AN OXIDE OR HYDROXIDE OF A GROUP II-A METAL, E.G., CA(OH)2 AND MGO, ADDITIONALLY CONTAIN A MINOR QUANTITY OF A WATER-ABSORPTIVE, BUT ESSENTIALLY WATER-ISOLUBLE COMPOUND WHICH IS, E.G., A SYNTHETIC ZEOLITE, SILICA GEL OR CALCIUM SULFATE. ANY OF THESE MATERIALS SERVE TO SCAVENGE SUFFICIENT WATER IN THE FORMULATION TO KEEP ITS INTIAL VISCOSITY INCREASE TO A MINUMUM AND PROVIDE AN EXTENDED WORK-LIFE THERETO. THE AGING VISCOSITY BUILD-UP IN THE FORMULATION SURPRISINGLY THEN SPROCEEDS AT A SIGNIFICANTLY ACCELARATED RATE SO THAT THICKENING OF THE POLYESTER TO A DESIRED HIGH LEVEL CAN BE ATTAINED TYPICALLY WITHIN 24 HOURS AFTER ITS PREPARATION.
Inventors
- 👤 F Volgstadt
- 👤 J Semancik
Bibliographic Details
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