Liquid ultraviolet stabilizer and method
First Claim
Patent Images
1. A UV stabilizer comprising an admixture of two or more different benzophenones having the general formula of:
- ##STR7## wherein 2 is OH, 2'"'"' is H or OH, 4 is OCn H2n+1 and 4'"'"' is H or OCn H2n+1, said admixture being liquid at 22°
C.
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Abstract
Liquid UV stabilizers which are stable at room temperatures or below made from di-substituted and tri-substituted benzophenone compositions. A process to render di-substituted and tri-substituted benzophenone admixtures stable liquids at room temperatures or below involving heating the admixture to a temperature in the range of 80°-175° C. for a period of time sufficient that when the admixture is cooled to room temperature the admixture remains liquid.
27 Citations
18 Claims
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1. A UV stabilizer comprising an admixture of two or more different benzophenones having the general formula of:
- ##STR7## wherein 2 is OH, 2'"'"' is H or OH, 4 is OCn H2n+1 and 4'"'"' is H or OCn H2n+1, said admixture being liquid at 22°
C. - View Dependent Claims (2, 12, 13)
- ##STR7## wherein 2 is OH, 2'"'"' is H or OH, 4 is OCn H2n+1 and 4'"'"' is H or OCn H2n+1, said admixture being liquid at 22°
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3. A UV liquid stabilizer comprising an admixture of:
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(a) 30-60 weight percent of a first di-substituted benzophenone having the general formula of;
##STR8## wherein 2 is OH, 2'"'"' is H or OH, 4 is OCn H2n+1 and 4'"'"' is H or OCn H2n+1 ; and(b) 30-60 weight percent of a second di-substituted benzophenone having the general formula of;
##STR9## wherein 2 is OH, 2'"'"' is H or OH, 4 is OCn H2n+1 and 4'"'"'is H or OCn H2n+1 ; and(c) 0-45 weight percent of a tri-substituted benzophenone having the general formula of;
##STR10## wherein 2 is OH, 2'"'"' is H or OH, 4 is OCn H2n+1 and 4'"'"' is H or OCn H2n+1 ; and(d) 0-35 weight percent of a compatible component, said admixture being a liquid at 25°
C. - View Dependent Claims (4, 5, 6, 7, 14, 15, 16, 17)
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8. A UV stabilizer composition comprising:
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(a) 10-60 weight percent of the first di-substituted benzophenone; (b) 10-40 weight percent of a second di-substituted benzophenone; (c) 5-15 percent of a third di-substituted benzophenone; and (d) 5-15 percent of a fourth di-substituted benzophenone, said admixture being a liquid at 25°
C. - View Dependent Claims (18)
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9. A process for rendering an admixture of benzophenones liquid below 25°
- C. comprising;
(a) admixing two or more benzophenones of the following general formula;
##STR11## wherein 2 is OH, 2'"'"' is H or OH, 4 OCn H2n+1 and 4'"'"' is H or OCn H2n+1 ; and(b) heating the admixture in the range of 80°
C. to 175°
C. to liquify the admixture;(c) maintaining the admixture at a temperature in the range of 80°
C. to 175°
C. for a predetermined time such that when the admixture is cooled it will remain liquid at 25°
C. for 2 hours. - View Dependent Claims (10)
- C. comprising;
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11. A liquid UV stabilizer comprising:
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(a) one or more di-substituted or tri-substituted benzophenone having the general formula;
##STR12## wherein 2 is OH, 2'"'"' is H or OH, 4 is OCn H2n+1 and 4'"'"' is H or OCn H2n+1.(b) a compatible component selected from the group consisting of acrylates, phosphates, salicylates, hindered amines, cinnamates or mixtures thereof, said composition being liquid at 25°
C.
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Specification