Binder resin with reduced hydroxyl content

Details Binder resin with reduced hydroxyl content Binder resin with reduced hydroxyl content

1999-09-01

2001-05-29

Goodrow, John (Department: 1753)

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Radiation-sensitive composition or product

C525S061000

Reexamination Certificate

active

06238833

ABSTRACT:

FIELD OF THE INVENTION
This invention is directed to a composition useful for an imaging layer of a photoreceptor and to a method for preparing the composition.
BACKGROUND OF THE INVENTION
Conventional charge generating dispersions typically include a charge generating material, a binder, and a solvent. As the binder, polyvinyl butyral resins such as the BUTVAR® resins may be used. Polyvinyl butyral resins are preferred materials for the binder since they yield robust charge generating dispersions with excellent coating quality and long pot life. However, the present inventors are aware that the use of polyvinyl butyral resins for the binder in a charge generating layer can decrease the sensitivity of the resulting photoreceptor. Thus, there is a need, which the present invention addresses, for modified polyvinyl butyral resins that when employed as the binder in a charge generating layer enable an increase in photoreceptor sensitivity without sacrificing dispersion quality.
BUTVAR® resins are described in a brochure (35 pages; copyright date 1989) from Monsanto Chemical Company.
Photoreceptor coating compositions are disclosed in Nealey et al., U.S. Pat. No. 5,418,107; Stegbauer et al., U.S. Pat. No. 5,324,615; Nukada et al., U.S. Pat. No. 5,393,629; and Mayama et al., U.S. Pat. No. 5,418,099.
SUMMARY OF THE INVENTION
The present invention is accomplished in embodiments by providing a composition including: a polymeric compound including a polyvinyl butyral moiety, an optional polyvinyl alcohol moiety, an optional polyvinyl acetate moiety, and a modified polyvinyl moiety of the formula
where R is an organic substituent, wherein the polyvinyl alcohol moiety has a hydroxyl content that ranges from 0% to about 5% by weight when —OR is an acetate.
There is also provided in embodiments a method comprising: selecting a polymer including a polyvinyl butyral moiety, a polyvinyl alcohol moiety, and an optional polyvinyl acetate moiety, wherein the polyvinyl alcohol moiety has a hydroxyl content of a first value, and decreasing the hydroxyl content to a lower second value that ranges from 0% by weight to less than the first value by reacting the polymer with a hydroxyl converting reactant to convert a portion of the repeating units of the polyvinyl alcohol moiety to a modified polyvinyl moiety of the formula
where R is an organic substituent, thereby resulting in a polymeric compound including the polyvinyl butyral moiety, the polyvinyl alcohol moiety having the hydroxyl content of the lower second value, the optional polyvinyl acetate moiety, and the modified polyvinyl moiety.


REFERENCES:
patent: 5324615 (1994-06-01), Stegbauer et al.
patent: 5393629 (1995-02-01), Nukada et al.
patent: 5418099 (1995-05-01), Mayama et al.
patent: 5418107 (1995-05-01), Nealey et al.
patent: 5571647 (1996-11-01), Mishra et al.
patent: 6027844 (2000-02-01), Nguyen et al.
Monsanto Chemical Company brochure entitled “Butvar® Polyvinyl Butyral Resin Properties & Use” (35 pages; copyright date 1989.

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