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US3865619A Expired / Lapsed US ⏱️ 0.0 years remaining

Anti-fogging hydrophilic resin coatings

Assignee: Roehm GmbH Darmstadt
•
Filing: 1972-12-11
•
Granted: 1975-02-11
•
Expires: 1992-12-11
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Abstract

Abstract The method of forming an anti-fogging coating on an optical surface by applying a solution of a hydrophilic film-forming resin in a water-miscible organic solvent to said surface to form a coating thereon and then drying and hardening said coating, said hydrophilic resin comprising: (A) AN ETHYLENICALLY UNSATURATED POLYMERIZABLE MONOMER HAVING A SALT-FORMING OR SALT GROUP THEREIN; (B) AT LEAST ONE MONOMER WHICH IS AN ESTER FORMED BETWEEN ACRYLIC ACID OR METHACRYLIC ACID AND AN ALCOHOL HAVING 1 TO 4 CARBON ATOMS, THE MONOMER OR MONOMER MIXTURE FORMING BY ITSELF A POLYMER OR COPOLYMER HAVING A T max-value between 30*C. and 80*C.; and (C) AN OPTIONAL CROSS-LINKING COMPONENT; INCLUDING THE STEP OF NEUTRALIZING SALT-FORMING GROUPS, IF PRESENT IN COMPONENT (A), AFTER FORMATION OF THE COATING, TO FORM SALT GROUPS THEREFROM; SAID RESIN, IN THE FORM OF A LAYER 30 TO 50 MICRONS THICK, SWELLING IN WATER AT 20*C. within 3 minutes to a volume 20 to 300 percent greater than its original volume. An optical surface having such an anti-fogging coating thereon.

Inventors

  • 👤 Horst Pennewiss
  • 👤 Hermann Plainer
  • 👤 Waldemar Schleier

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 23:40
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18; C08; C08F; C08F8/00; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/064; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31645; Y10T428/31649; Y10T428/31855; Y10T428/31935

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 87 words
THE METHOD OF FORMING AN ANTI-FOGGING COATING ON AN OPTICAL SURFACE WHICH COMPRISES APPLYING A SOLUTION OF A HYDROPHILLIC FILM-FORMING RESIN IN AN ALIPHATIC ALCOHOL HAVING FROM 1- 4 CARBON ATOMS TO SAID SURFACE TO FORM A COATING THEREON AND DRYING AND HARDENING SAID COATING AT TEMPERATURES UP TO 160*C., WHEREIN SAID HYDROPHILLIC RESIN COMPRISES A 12-30 PERCENT OF AN ETHYLENICALLY UNSATURATED POLYMERIZABLE CARBOXYLIC ACID HAVING FROM 3 TO 5 CARBON ATOMS, OR AN ALKALI METAL OR AMMONIUM SALT THEREOF, OR OF A COMPOUND OF THE FORMULAS
Claim 2
Independent Claim 87 words
THE METHOD OF FORMING AN ANTI-FOGGING COATING ON AN OPTICAL SURFACE WHICH COMPRISES APPLYING A SOLUTION OF A HYDROPHILLIC FILM-FORMING RESIN IN AN ALIPHATIC ALCOHOL HAVING FROM 1- 4 CARBON ATOMS TO SAID SURFACE TO FORM A COATING THEREON AND DRYING AND HARDENING SAID COATING AT TEMPERATURES UP TO 160*C., WHEREIN SAID HYDROPHILLIC RESIN COMPRISES A 12-30 PERCENT OF AN ETHYLENICALLY UNSATURATED POLYMERIZABLE CARBOXYLIC ACID HAVING FROM 3 TO 5 CARBON ATOMS, OR AN ALKALI METAL OR AMMONIUM SALT THEREOF, OR OF A COMPOUND OF THE FORMULAS
Claim 3
Dependent Claim 54 words
A method as in claim 1 wherein component (b) of said resin additionally comprises up to 10 percent, by weight of the resin, of a further comonomer selected from the group consisting of esters of acrylic and methacrylic acid having more than 4 carbon atoms in the alcohol portion thereof, styrene, acrylonitrile, and methacrylonitrile.
Claim 4
Dependent Claim 12 words
A method as in claim 1 wherein a compound of the formula
Claim 5
Dependent Claim 31 words
A method as in claim 3 wherein said compound is present in combination with acrylic acid, methacrylic acid, hydrochloric acid, acrylamide, methacrylamide, or an hydroxyalkyl ester of acrylic or methacrylic acid.
Claim 6
Dependent Claim 27 words
The method as in claim 1 wherein component (a) of said resin comprises basic salt-forming groups and said coating is neutralized with an acid after formation thereof.
Claim 7
Dependent Claim 27 words
The method as in claim 1 wherein compound (a) of said resin comprises acidic salt-forming groups and said coating is neutralized with a base after formation thereof.
Claim 8
Dependent Claim 19 words
An optical surface having thereon an anti-fogging coating of a hydrophilic film-forming resin prepared by the method of claim

References Cited (Backward Citations)

US3294726A Cited
US3437617A Cited
US3597384A Cited
US3625741A Cited
US3488215A Cited
US3515579A Cited
US3745042A Cited
US3779792A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-02-10 1978-08-12 1979-02-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-02-10 1982-08-12 1983-02-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-02-10 1986-08-12 1987-02-11 $7700.00 Window Closed / Lapsed

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