Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1990-07-20
1991-12-17
Bell, Janyce
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427 40, 427164, 427165, 427322, 427387, 4273897, 4273935, 427397, 427 7, 252582, 523212, B05D 506
Patent
active
050734040
ABSTRACT:
Retroreflective sheeting has been improved by a coating comprising silica and a transparent polymer selected from aliphatic polyurethanes, polyvinyl chloride copolymers having a minor amount of a comonomer containing at least one carboxylic acid or hydroxyl moiety, and acrylic polymers. Silica comprises 10-80 weight percent (10-70% in the case of polyacrylates) of the transparent protective coating. For example, a solution or dispersion of polyurethane is mixed with a silica sol and possibly other ingredients (e.g. wetting agent, UV light absorber and adhesion promoter), and the composition is coated onto the retroreflective sheet and dried. The coated retroreflective sheeting has superior soil and dew repellancy, retaining a higher percentage of original brightness after exposure to dirt and/or dew conditions.
REFERENCES:
patent: 2326634 (1943-08-01), Gebhard et al.
patent: 2366516 (1945-01-01), Geffeken et al.
patent: 2407680 (1946-09-01), Palmquist et al.
patent: 3706589 (1972-12-01), Fukada et al.
patent: 3914469 (1975-10-01), Delano et al.
patent: 3940359 (1976-02-01), Chambers
patent: 4025159 (1977-05-01), McGrath
patent: 4085245 (1978-04-01), De Vito et al.
patent: 4311763 (1982-01-01), Conroy
patent: 4367920 (1983-01-01), Tung et al.
patent: 4390373 (1983-06-01), White et al.
patent: 4409285 (1983-10-01), Swerdlow
patent: 4442177 (1984-04-01), Noda et al.
patent: 4476281 (1984-10-01), Vaughn, Jr.
patent: 4499217 (1985-02-01), Yoshimura et al.
patent: 4505967 (1985-03-01), Bailey
patent: 4513112 (1985-04-01), Ernst et al.
patent: 4522958 (1985-06-01), Das et al.
patent: 4528319 (1985-07-01), Ottaviani et al.
patent: 4554214 (1985-11-01), Ichinomiya et al.
patent: 4576864 (1986-03-01), Krautter et al.
patent: 4596745 (1986-06-01), Chao
patent: 4600735 (1986-07-01), Larsson et al.
patent: 4605594 (1986-08-01), Owens et al.
patent: 4663213 (1987-05-01), Bailey et al.
patent: 4664966 (1987-05-01), Bailey et al.
patent: 4672089 (1987-06-01), Pricone et al.
Wright et al, Solid Polyurethane Elastomers, Maclaren & Sons, London, 1969, p. 78.
Cramm, R. H. and Bibee, D. V., "The Theory of Practice of Corona Treatment for Improving Adhesion", TAPPI, Aug., 1982, pp. 75-78.
Bell Janyce
Griswold Gary L.
Kirn Walter N.
Little Douglas B.
Minnesota Mining and Manufacturing Company
LandOfFree
Silica coating composition for reflective sheeting does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Silica coating composition for reflective sheeting, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Silica coating composition for reflective sheeting will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-834612