Water repellent for masonry
AssigneeGeneral Electric Company
InventorDuane F. Merrill
Life of this patent
Estimating the term…
Abstract
There is provided a silicone composition for rendering surfaces stain resistant and water repellent comprising: (a) an organopolysiloxane resin selected from the group consisting of resins having R.sub.3 SiO.sub.0.5 units and SiO.sub.2 units, the ratio of R.sub.3 SiO.sub.0.5 units to SiO.sub.2 units, ranging from about 0.2 to about 0.9:1 and resins having R.sub.3 SiO.sub.0.5 units, R.sub.2 SiO units, and SiO.sub.2 units, the ratio of R.sub.3 SiO.sub.0.5 units to SiO.sub.2 ranging from about 0.2 to about 0.9:1 and the ratio of R.sub.2 SiO units to SiO.sub.2 units being up to about 0.1:1 where each R is independently selected from substituted or unsubstituted hydrocarbon radical of from 1 to 8 carbon atoms; (b) alkyl-alkoxypolysiloxane resin; and (c) an effective amount of condensation catalyst.
Claims13
A composition of matter comprising:
- (a) organopolysiloxane resin selected from the group consisting of resins having R.sub.3 SiO.sub.0.5 units and SiO.sub.2 units, the ratio of R.sub.3 SiO.sub.0.5 units to SiO.sub.2 units, ranging from about 0.2 to about 0.9:1 and resins having R.sub.3 SiO.sub.0.5 units, R.sub.2 SiO units, and SiO.sub.2 units, the ratio of R.sub.3 SiO.sub.0.5 units to SiO.sub.2 ranging from about 0.2 to about 0.9:1 and the ratio of R.sub.2 SiO units to SiO.sub.2 units being up to about 0.1:1 where each R is a substituted or unsubstituted monovalent hydrocarbon radicals from 1 to about 8 carbon atoms;
- (b) 5 to 500 parts by weight alkyl-alkoxypolysiloxane resin for each 100 parts by weight organopolysiloxane resin said alkyl-alkoxypolysiloxane having the empirical formula:
- RSi(OR.sup.1).sub.n O.sub.(3-n)/2
- wherein n is a number from about 1/3 to about 1 and R.sup.1 is a substituted or unsubstituted condensable hydrocarbon radical of from 1 to 6 carbon atoms and R is a substituted or unsubstituted hydrocarbon radical of from 1 to 8 carbon atoms;
- and
- (c) an effective amount of condensation catalyst.
A composition of matter comprising:
- (a) organopolysiloxane resin selected from the group consisting of resins having R.sub.3 SiO.sub.0.5 units and SiO.sub.2 units, the ratio of R.sub.3 SiO.sub.0.5 units to SiO.sub.2 units, ranging from about 0.2 to about 0.9:1 and resins having R.sub.3 SiO.sub.0.5 units, R.sub.2 SiO units, and SiO.sub.2 units, the ratio of R.sub.3 SiO.sub.0.5 units to SiO.sub.2 ranging from about 0.2 to about 0.9:1 and the ratio of R.sub.2 SiO units to SiO.sub.2 units being up to about 0.1:1 where each R is a substituted or unsubstituted monovalent hydrocarbon radical of from 1 to 8 carbon atoms;
- (b) sufficient alkyl-alkoxypolysiloxane resin that the composition forms a film and is curable to a dry, tack-free composition but not so much that the composition is curable to insolubility in mineral spirits said alkyl-alkoxypolysiloxane having the empirical formula:
- RSi(OR.sup.1).sub.n O.sub.(3-n)/2
- wherein n is a number from about 1/3 to about 1 and R.sup.1 is a substituted or unsubstituted condensable hydrocarbon radical of from 1 to 6 carbon atoms and R is a substituted or unsubstituted hydrocarbon radical of from 1 to 8 carbon atoms;
- and
- (c) an effective amount of condensation catalyst.
A method for rendering surfaces stain resistant and water repellent comprising the steps of:
- (I) applying a composition comprising:
- (a) organopolysiloxane resin selected from the group consisting of resins having R.sub.3 SiO.sub.0.5 units and SiO.sub.2 units, the ratio of R.sub.3 SiO.sub.0.5 units to SiO.sub.2 units, ranging from about 0.2 to about 0.9:1 and resins having R.sub.3 SiO.sub.0.5 units, R.sub.2 SiO units, and SiO.sub.2 units, the ratio of R.sub.3 SiO.sub.0.5 units to SiO.sub.2 ranging from about 0.2 to about 0.9:1 and the ratio of R.sub.2 SiO units to SiO.sub.2 units being up to about 0.1:1 where each R is a substituted or unsubstituted monovalent hydrocarbon radical of from 1 to 8 carbon atoms;
- (b) 5 to 500 parts by weight an alkyl-alkoxypolysiloxane resin for each 100 parts by weight organopolysiloxane resin, said alkyl-alkoxypolysiloxane having the empirical formula:
- RSi(OR.sup.1).sub.n O.sub.(3-n)/2
- wherein n is a number from about 1/3 to about 1 and R.sup.1 is a substituted or unsubstituted condensable hydrocarbon radical of from 1 to 6 carbon atoms and R is a substituted or unsubstituted hydrocarbon radical of from 1 to 8 carbon atoms;
- and
- (c) an effective amount of condensation catalyst;
- and
- (d) sufficient organic solvent to form a solution at from about 5 to about 60% by weight solids;
- and
- II. evaporating the solvent.
Dependencies are inferred from the claim text.