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POLYCAPROLACTONE AS A HIGH MOLECULAR WEIGHT POLYMERIC SOLVENT FOR DISPERSING DYES AND CONDUCTIVE ADDITIVES

IP.com Disclosure Number: IPCOM000023678D
Original Publication Date: 1978-Oct-31
Included in the Prior Art Database: 2004-Mar-31

Publishing Venue

Xerox Disclosure Journal

Abstract

Polycaprolactone (PCL) has a melting point of about 60°C; and when it is added to boiling, aqueous solutions containing aromatic structured dye molecules (above the melting point of the PCL) , the PCL extracts the dye from the aqueous phase thereby acting effectively as a "good solvent" in which such dyes may be dispersed. The PCL can be readily melt blended or solution cured with a wide variety of semicrystalline and amorphous polymers acting effectively as a high molecular weight "compatible solvent" for such polymers. In this manner, the PCL is dispersed in micro-domains sufficiently small so that it does not scatter light and thus produces films which are optically clear, Thus, in the prior art, PCL is used commercially as a dyeing additive for a wide variety of polymers which could not readily be dyed directly because the dyes crystallize due to phase out, Only small quantities of dyed PCL are required, for example, 0,5 to 3 weight percent PCL to achieve the color. Hence, mechanical melting point characteristics are not generally altered to any significant extent,