Claims
- 1. A sunscreen composition comprising
- (I) an organosilicon compound having at least one unit of the formula ##STR24## any other units present in the said organosilicon compound being represented by the formula ##EQU1## wherein R represents an alkyl group having up to 18 carbon atoms; R' is selected from the group consisting of divalent alkylene, oxyalkylene, alkenylene and oxyalkenylene groups having from 2 to 20 carbon atoms, wherein the R' group is attached to a silicon atom; R" is selected from the group consisting of halogen atoms and alkyl, aryl, alkoxy and alkoxyalkoxy groups having less than 9 carbon atoms; Q is selected from the group consisting of hydrogen, monovalent hydrocarbon and halogenated hydrocarbon groups having less than 19 carbon atom; Z is selected from the group consisting of alkyl and alkoxy groups having from 1 to 8 carbon atoms and hydroxyl groups; a and b are integers with a value from 0 to 3; and c is an integer selected from 0 to 1; and at least one of Z and R' is linked to the multivalent aryl group via an ether linkage;
- and (II) an inert carrier selected from solvents and cream base materials.
- 2. A sunscreen composition as claimed in claim 1 wherein in the organosilicon compound a is an integer with a value from 0 to 2 and a maximum of 20% of all units are units of the general formula (i).
- 3. A sunscreen composition as claimed in claim 1 wherein in the organosilicon compound the units of the general formula (i) are only present as terminal units of the organosilicon compound.
- 4. A sunscreen composition as claimed in claim 1 wherein in the organosilicon compound the unit (i) is selected from the formulae ##STR25## wherein R, R' and R", Z, a and c are as defined previously; R* is selected from the group consisting of divalent oxyalkylene and oxyalkenylene groups having from 2 to 20 carbon atoms linked to --(C.sub.6 H.sub.4-c)--via a oxygen atom, a carbon-carbon double bond, if present, being attached to the silicon atom; and Z' is selected from the group consisting of hydroxyl and alkoxy groups having 1 to 8 carbon atoms.
- 5. A sunscreen composition as claimed in claim 1 wherein the organosilicon compound is a substantially linear organosiloxane polymer with at least 80% of all R" and Q groups being methyl groups.
- 6. A sunscreen composition as claimed in claim 1 wherein in the organosilicon compound R' has 3 to 4 carbon atoms and Z is selected from methoxy and ethoxy.
- 7. A sunscreen composition as claimed in claim 4 wherein in the organosilicon compound R' and R" have 3 to 4 carbon atoms and Z and Z' are selected from methoxy and ethoxy.
- 8. A sunscreen composition as claimed in claim 1 wherein the organosilicon compound has a maximum absorbance at 300 to 320 nm.
- 9. A sunscreen composition as claimed in claim 1 wherein the organosilicon compound has a total of at least 100 units, each unit selected from those of the general formulae (i) and (ii).
- 10. A sunscreen composition as claimed in claim 1 wherein the inert carrier is selected from solvents.
- 11. A sunscreen composition as claimed in claim 1 wherein the inert carrier is selected from cream base materials.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8718140 |
Jul 1987 |
GBX |
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Parent Case Info
This is a divisional of co-pending application Ser. No. 07/226,326, filed on July 29, 1988, now U.S. Pat. No. 4,912,261.
Foreign Referenced Citations (1)
Number |
Date |
Country |
0138590 |
Apr 1985 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
226326 |
Jul 1988 |
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