Preparation of lignocellulosic products
View Patent ↗A method of preparing a polymeric methylene diphenyl diisocyanate-polydialkylsiloxane resin by mixing at a temperature between 25° C. and 100° C.: (i) a polymeric methylene diphenyl diisocyanate with (ii) a polydialkylsiloxane selected from hydroxyalkyl dialkyl terminated polydialkylsiloxane having a viscosity of from 5 to 500 000 cSt at 25° C. or (hydroxyalkoxy)alkyl dialkyl terminated polydialkylsiloxane having a viscosity of from 5 to 500 000 cSt at 25° C. in an amount such that from 1 to 99% by weight of the total weight of (i) and (ii) is component (ii), optionally in the presence of a solvent; and subsequently extracting the solvent, if present.
1. A method of preparing a polymeric methylene diphenyl diisocyanate-polydialkylsiloxane resin comprising isocyanate functionality by mixing at a temperature between 25° C. and 100° C.:
(i) polymeric methylene diphenyl diisocyanate with
(ii) a 3-(2-hydroxyethoxy) propyl dimethyl terminated polydimethylsiloxane having a general formula of:
where z is a value of between 0 and 500, the polydimethylsiloxane having a viscosity of from 5 to 500 000 cSt at 25° C., in the presence of toluene; and subsequently extracting the solvent, if present; and
wherein component (i) is present in an amount of from 40 to 80% of the total weight of (i) and (ii).
2. A method in accordance with claim 1 wherein component (i) is present in an amount of from 50 to 80% of the total weight of (i) and (ii).
3. A method in accordance with claim 1 wherein the value of z is between 5 and 25.
4. A method in accordance with claim 1 wherein the polymeric methylene diphenyl diisocyanate (i) has the general structure
where the average value of n is from 0 to 10.
5. A method in accordance with claim 1 wherein the value of z is between 5 and 15.
6. A method in accordance with claim 5 wherein the 3-(2-hydroxyethoxy) propyl dimethyl terminated polydimethylsiloxane has a viscosity of from 5 to 10,000 cSt at 25° C.
7. A method in accordance with claim 1 wherein the 3-(2-hydroxyethoxy) propyl dimethyl terminated polydimethylsiloxane has a viscosity of from 5 to 1,500 cSt at 25° C.
8. A method of preparing a polymeric methylene diphenyl diisocyanate-polydialkylsiloxane resin comprising isocyanate functionality by mixing at a temperature between 25° C. and 100° C.:
(i) polymeric methylene diphenyl diisocyanate with
(ii) a 3-(2-hydroxyethoxy) propyl dimethyl terminated polydimethylsiloxane having a general formula of:
where z is a value of between 0 and 500, the polydimethylsiloxane having a viscosity of from 5 to 500 000 cSt at 25° C., optionally in the presence of a solvent; and
subsequently extracting the solvent, if present; and
wherein component (i) is present in an amount of from 40 to 80% of the total weight of (i) and (ii); and
wherein the step of mixing is defined as:
(a) mixing the component (i) with the solvent to form a mixture of the component (i) and the solvent, and heating the mixture of the component (i) and the solvent to a temperature of between 50 and 100° C.,
(b) mixing the component (ii) with the solvent to form a mixture of the component (ii) and the solvent,
(c) mixing the mixture of the component (i) and the solvent with the mixture of the component (ii) and the solvent to form a mixture of the component (i), the component (ii), and the solvent, and
(d) agitating the mixture of the component (i), the component (ii), and the solvent for a predetermined period of time.
9. A method in accordance with claim 8 wherein the solvent is present and is toluene.
10. A method in accordance with claim 8 wherein component (i) is present in an amount of from 50 to 80% of the total weight of (i) and (ii).
11. A method in accordance with claim 8 wherein the value of z is between 5 and 25.
12. A method in accordance with claim 8 wherein the polymeric methylene diphenyl diisocyanate (i) has the general structure
where the average value of n is from 0 to 10.
13. A method in accordance with claim 8 wherein the value of z is between 5 and 15.
14. A method in accordance with claim 13 wherein the 3-(2-hydroxyethoxy) propyl dimethyl terminated polydimethylsiloxane has a viscosity of from 5 to 10,000 cSt at 25° C.
15. A method in accordance with claim 8 wherein the 3-(2-hydroxyethoxy) propyl dimethyl terminated polydimethylsiloxane has a viscosity of from 5 to 1,500 cSt at 25° C.