Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2007-02-13
2007-02-13
Lipman, Bernard (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C430S536000, C525S061000
Reexamination Certificate
active
10790124
ABSTRACT:
The present invention has an object of the present invention to provide a polyvinyl acetal resin for heat-developable photosensitive materials as well as a heat-developable photosensitive material while solving such problems as coating solution pot life, coloration of heat-developable photosensitive material, fog, poor gradation, insufficient sensitivity and poor undeveloped film storability and making it possible for the materials to acquire good image characteristics.The present invention is constituted of a polyvinyl acetal resin for heat-developable photosensitive materialswhich is a polyvinyl acetal resin synthesized by the acetalization reaction between a polyvinyl alcohol and an aldehyde andwhich comprises having a degree of polymerization of 200 to 3,000, a residual acetyl group content of 0 to 25 mole percent and a residual hydroxyl group content of 17 to 35 mole percent, as calculated while regarding one acetal group as two acetalized hydroxyl groups, a water content of not more than 2.5% by weight and a residual aldehyde content of not more than 10 ppm and is free of any antioxidant.
REFERENCES:
patent: 3785830 (1974-01-01), Sullivan et al.
patent: 4281060 (1981-07-01), Usami et al.
patent: 4413091 (1983-11-01), Iwasaki et al.
patent: 4652604 (1987-03-01), Walls et al.
patent: 4655124 (1987-04-01), Child
patent: 4707437 (1987-11-01), Walls et al.
patent: 4772538 (1988-09-01), Walls et al.
patent: 4780392 (1988-10-01), Walls et al.
patent: 4822720 (1989-04-01), Walls et al.
patent: 4895788 (1990-01-01), Walls et al.
patent: 4927737 (1990-05-01), Walls et al.
patent: 5120772 (1992-06-01), Walls et al.
patent: 5466751 (1995-11-01), Gutweiler et al.
patent: 0 211 406 (1987-02-01), None
patent: 43-4924 (1964-04-01), None
patent: 5-140211 (1993-06-01), None
patent: 5-155915 (1993-06-01), None
patent: 10-338713 (1998-12-01), None
Frank Ruttens,Polyvinylbutyral, More Than Just a Binder, Journal of Imaging Science and Technology, vol. 43, No. 6, Nov./Dec. 1999, pp. 535-539.
Lipman Bernard
Sekisui Chemical Co. Ltd.
LandOfFree
Polyvinyl acetal resin for heat-developable photosensitive... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyvinyl acetal resin for heat-developable photosensitive..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyvinyl acetal resin for heat-developable photosensitive... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3869952