Photographic matt layers or surfaces

Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified backing or protective layer containing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

430539, 430950, 430961, G03C 526, G03C 178

Patent

active

042359597

ABSTRACT:
Hydrophilic coating compositions are made comprising a protective colloid and dispersed therein a matting agent. The matting agent is obtained by mixing in aqueous medium area, formaldehyde and an aqueous colloidal dispersion of silica. The mixture is buffered to keep the pH at 3.2 or lower. Urea and formaldehyde are polycondensed while vigorously stirring until particles comprising urea-formaldehyde resin and silica are formed of average particle size of 1-8 .mu.m. The rate of stirring is reduced and the pH is raised to 5 or higher to prevent afterpolycondensation and agglomeration of the polymer particles. A hydrophilic colloid is then dissolved in the reaction mixture.
Photographic light-sensitive silver halide material incorporating a layer formed from the hydrophilic coating composition.

REFERENCES:
patent: 1929290 (1933-10-01), Schmidt
patent: 2819165 (1958-01-01), Mackey
patent: 3253926 (1966-05-01), Van Pee
patent: 3539378 (1970-11-01), Shephard et al.
patent: 3627563 (1971-12-01), Bollen et al.
patent: 3915709 (1975-10-01), Welch
patent: 3920456 (1975-11-01), Nittel

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Photographic matt layers or surfaces does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photographic matt layers or surfaces, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photographic matt layers or surfaces will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1130203

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.