MQ-T propyl siloxane resins
MQ-T propyl siloxane resins comprising (R 1 3 SiO 1/2 ) a , (R 2 2 SiO 2/2 ) b , (R 3 SiO 3/2 ) c , and (SiO 4/2 ) d units, where at least 40 mole % of the R 3 groups are propyl are disclosed. A method of preparing such siloxane resins by reacting a MQ siloxane resin with a T propyl siloxane resin is also disclosed. These siloxane resins are useful in a variety of personal, household, and medical care applications, and in particular, as a resin additive in pigmented cosmetic formulations.
1. A siloxane resin comprising the units:
(i) (R 1 3 SiO 1/2 ) a
(ii) (R 2 2 SiO 2/2 ) b
(iii) (R 3 SiO 3/2 ) c , and
(iv) (SiO 4/2 ) d
wherein
R 1 , R 2 , and R 3 are independently an alkyl group having from 1 to 8 carbon atoms, an aryl group, a carbinol group, or an amino group,
a has a value 0.05 to 0.5,
b has a value of zero to 0.3,
c has a value of 0.05 to 0.65,
d has a value of 0.05 to 0.6,
the value of a+b+c+d=1,
and the siloxane resin has a weight average molecular weight of 26,900 to 25,300,000 and with the proviso that greater than 40 mole % of the R 3 groups in the siloxane resin are propyl.
2. The siloxane resin of claim 1 wherein the siloxane resin is selected from MQ-T propyl resins comprising the units;
((CH 3 ) 3 SiO 1/2 ) a ,
(R 3 SiO 3/2 ) c , where R 3 ═CH 3 CH 2 CH 2 —, and
(SiO 4/2 ) d
MQ-T propyl resins comprising the units;
((CH 3 ) 3 SiO 1/2 ) a ,
((CH 3 ) 2 SiO 2/2 ) b ,
(R 3 SiO 3/2 ) c , where R 3 ═CH 3 CH 2 CH 2 —, and
(SiO 4/2 ) d
MQ-T propyl resins comprising the units;
((CH 3 ) 3 SiO 1/2 ) a ,
((CH 3 ) 2 SiO 2/2 ) b , ((CH 3 )(C 6 H 5 )SiO 2/2 ) b ,
(R 3 SiO 3/2 ) c , where R 3 ═CH 3 CH 2 CH 2 —, and
(SiO 4/2 ) d
MQ-T propyl resins comprising the units;
((CH 3 ) 3 SiO 1/2 ) a ,
((CH 3 ) 2 SiO 2/2 ) b ,
(R 3 SiO 3/2 ) c , where R 3 ═CH 3 CH 2 CH 2 —, and (C 6 H 5 SiO 3/2 ) c
(SiO 4/2 ) d
MQ-T propyl resins comprising the units;
((CH 3 ) 3 SiO 1/2 ) a ,
((CH 3 ) 2 SiO 2/2 ) b , ((CH 3 )(C 6 H 5 )SiO 2/2 ) b ,
(R 3 SiO 3/2 ) c , where R 3 ═CH 3 CH 2 CH 2 —, (C 6 H 5 SiO 3/2 ) c , and
(SiO 4/2 ) d
wherein a has a total value in the resin of 0.05 to 0.5, the sum of b+b′ has a total value in the resin of zero to 0.3, c has a total value in the resin of 0.05 to 0.65, and d has a total value in the resin of 0.05 to 0.6.
3. A method of making a siloxane resin comprising reacting:
A) a MQ resin comprising at least 80 mole % (R 1 3 SiO 1/2 ) a and (SiO 4,2 ) d units
where R 1 is an alkyl group having from 1 to 8 carbon atoms, an aryl group, a carbinol group, or an amino group,
a and d has a value greater than zero, and
the ratio of a/d is 0.5 to 1.5;
and
B) a T propyl resin comprising at least 80 mole % R 3 SiO 3/2 units,
where R 3 is an alkyl group having from 1 to 8 carbon atoms,
an aryl group, a carbinol group, or an amino group,
c has a value greater than zero,
and with the provisio that at least 40 mole % of the R 3 groups are propyl,
wherein the weight ratio of A/B is from 95:5 to 15:85.
4. A personal care product comprising the siloxane resin of claim 1 .
5. The personal care product of claim 4 , where the personal care product is a cosmetic product.
6. The personal care product of claim 4 , where the personal care product is a hair care product.
7. A personal care product comprising the siloxane resin of claim 2 .
8. The personal care product of claim 7 , where the personal care product is a cosmetic product.
9. The personal care product of claim 7 , where the personal care product is a hair care product.