Epoxy-containing polysiloxane oligomer compositions, process for making same and uses thereof
View Patent ↗The present invention relates to stable, zero or low VOC epoxy-containing polysiloxane oligomer compositions that provide for a high degree of chemical resistance to compositions containing organic resins, while at the same time, maintaining or improving the flexibility of these organic resin-containing compositions, to processes for preparing epoxy-containing polysiloxane oligomer compositions, and to uses in coatings, sealants, adhesives, and composites containing the same.
1. An epoxy-containing polysiloxane oligomer composition comprising,
(i) from 5 to 65 mole percent of a polysiloxane of the Formula (I):
(ii) from 10 to 55 mole percent of a polysiloxane of the Formula (II):
(iii) from 5 to 45 mole percent of a polysiloxane of the Formula (III):
(iv) from 1 to 20 mole percent of a polysiloxane of the Formula (IV):
(v) from 0.1 to 20 mole percent of a polysiloxane of the Formula (V):
wherein each occurrence of R 1 is —CH 2 CH 2 CH 2 — and the mole percent of components (i), (ii), (iii), (iv) and (v) are based upon the sum of the molar amounts of components (i), (ii), (iii), (iv) and (v).
2. The epoxy-containing polysiloxane oligomer composition of claim 1 , wherein component (i) is from 9 to 30 mole percent, component (ii) is from 30 to 50 mole percent; component (iii) is from 20 to 40 mole percent; component (iv) is from 5 to 18 mole percent; component (v) is from 2 to 8 mole percent, wherein the mole percent of components (i), (ii), (iii), (iv) and (v) are based upon the sum of the molar amounts of components (i), (ii), (iii), (iv) and (v).
3. The epoxy-containing polysiloxane oligomer composition of claim 2 , wherein component (i) is from 10 to 20 mole percent, component (ii) is from 35 to 48 mole percent; component (iii) is from 25 to 35 mole percent; component (iv) is from 7 to 15 mole percent; and component (v) is from 3 to 6 mole percent, wherein the mole percent of components (i), (ii), (iii), (iv) and (v) are based upon the sum of the molar amounts of components (i), (ii), (iii), (iv) and (v).
4. The epoxy-containing polysiloxane oligomer composition of claim 1 wherein the polysiloxane oligomer composition has a viscosity of from 50 centistokes to 250 centistokes at 20° C. in accordance with ASTM method D-1545.
5. The epoxy-containing polysiloxane oligomer composition of claim 1 wherein the polysiloxane oligomer composition has a number average molecular weight of from 500 grams per mole to 700 grams per mole.
6. The epoxy-containing polysiloxane oligomer composition of claim 1 wherein the polysiloxane oligomer composition has less than 1 weight percent releasable alcohol, based upon the sum of the weights for components (i), (ii), (iii), (iv) and (v).
7. The epoxy-containing polysiloxane oligomer composition of claim 1 further comprising a stabilizing agent having the Formula (VII):
R 4 (OR 5 ) p (VII)
wherein:
R 4 is a boron atom, a HP(═O)(−) 2 group, a P(═O)(−) 3 group, a R 6 C(═O)(−) group a polyvalent hydrocarbon group containing from 3 to 20 carbon atoms;
each R 5 is independently a hydrogen, a R 6 C(═O)(−) group, or a hydrocarbon containing from 1 to 6 carbon atoms;
each R 6 is independently a monovalent hydrocarbon containing from 1 to 5 carbon atoms; and
p is an integer of from 1 to 6.
8. The polysiloxane composition of claim 7 wherein the stabilizing agent is selected from the group consisting of boric acid, phosphoric acid, phosphorus acid, acetic acid, acetic acid anhydride, glycerol, 2-methyl-1,3-propanediol, 1-methoxy-2,3-propanediol, 1,2-hexanediol, and 2,3-dimethyl-2,3-butanediol.