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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
Document File: 4 page(s) / 824K

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,

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

POLYCAPROLACTONE AS A HIGH Proposed Classification
MOLECULAR WEIGHT POLYMERIC U,S~ Cl~ 260/78L
SOLVENT FOR DISPERSING DYES Into Cl, C08g 69/44
AND CONDUCTIVE ADDITIVES
George J. Safford

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,

In accordance with the present proposal, PCL has utility in
several xerographic materials, For example, it can be used in
the production of colored toners; and it can be used for the
dispersion of conductive additives, such as quaternary
ammonium salts and Rhodamine in polymers used for belts, webs,
scrolls, bias rolls and photoreceptor overcoat compositions,
where normally the solubility of such additives is suf~
ficiently low to preclude their use for such applications,
PCL aids in the ability to "solubilize" conductive additives,
such as tetraheptyl ammonium bromide, in such materials as
butadiene/acrylonitrile copolymers, PCL is also used to
disperse dyes, pigments and other colorants in xerographic
toner materials,

As an example of the application of PCL as a high-~molecular
weight polymeric solvent, PCL was used as a carrier for the
incorporation of conductive additives in polymers. The base
polymers had glass transition temperatures of 150°C and
exhibited crystalline properties at room temperature.

Volume 3 Number 5 September/October 1978 311

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Page 2 of 4

POLYCAPROLACTONE AS A HIGH MOLECULAR WEIGHT POLYMERIC SOLVENT
FOR DISPERSING DYES AND CONDUCTIVE ADDITIVES (Cont~d)

Additives, listed in the Table atta...