This invention relates to novel preformed stabilizers in which a portion of the polymer control agent is recovered and comprises from 10 to 1500 ppm of an inhibitor. This invention also relates to a process for preparing these preformed stabilizers, and to polymer polyols comprising these novel preformed stabilizers macromers and to a process for preparing polymer polyols comprising these novel preformed stabilizers. The present invention also relates to polyurethane foams comprising these polymer polyols, and to processes for preparing these polyurethane foams.

This invention relates to novel preformed stabilizers in which a portion of the polymer control agent is recovered and comprises from 10 to 1500 ppm of an inhibitor. This invention also relates to a process for preparing these preformed stabilizers, and to polymer polyols comprising these novel preformed stabilizers macromers and to a process for preparing polymer polyols comprising these novel preformed stabilizers. The present invention also relates to polyurethane foams comprising these polymer polyols, and to processes for preparing these polyurethane foams.

This invention relates to novel preformed stabilizers in which a portion of the polymer control agent is recovered and comprises from 10 to 1500 ppm of an inhibitor. This invention also relates to a process for preparing these preformed stabilizers, and to polymer polyols comprising these novel preformed stabilizers macromers and to a process for preparing polymer polyols comprising these novel preformed stabilizers. The present invention also relates to polyurethane foams comprising these polymer polyols, and to processes for preparing these polyurethane foams.

This document relates to methods for preventing or inhibiting the cracking or explosion of cement in an oil well using cement compositions that contain polyrotaxane additives. The cement compositions containing the polyrotaxane additives exhibit increased resiliency to cracking as compared to the same cement without the polyrotaxane additive.

This document relates to methods for preventing or inhibiting the cracking or explosion of cement in an oil well using cement compositions that contain polyrotaxane additives. The cement compositions containing the polyrotaxane additives exhibit increased resiliency to cracking as compared to the same cement without the polyrotaxane additive.

Novel support material formulations, characterized as providing a cured support material with improved dissolution rate, while maintaining sufficient mechanical strength, are disclosed. The formulations comprise a water-miscible non-curable polymer, a first water-miscible, curable material and a second, water-miscible material that is selected capable of interfering with intermolecular interactions between polymeric chains formed upon exposing the first water-miscible material to curing energy. Methods of fabricating a three-dimensional object, and a three-dimensional object fabricated thereby are also disclosed.

Novel support material formulations, characterized as providing a cured support material with improved dissolution rate, while maintaining sufficient mechanical strength, are disclosed. The formulations comprise a water-miscible non-curable polymer, a first water-miscible, curable material and a second, water-miscible material that is selected capable of interfering with intermolecular interactions between polymeric chains formed upon exposing the first water-miscible material to curing energy. Methods of fabricating a three-dimensional object, and a three-dimensional object fabricated thereby are also disclosed.

Novel support material formulations, characterized as providing a cured support material with improved dissolution rate, while maintaining sufficient mechanical strength, are disclosed. The formulations comprise a water-miscible non-curable polymer, a first water-miscible, curable material and a second, water-miscible material that is selected capable of interfering with intermolecular interactions between polymeric chains formed upon exposing the first water-miscible material to curing energy. Methods of fabricating a three-dimensional object, and a three-dimensional object fabricated thereby are also disclosed.

A branched organosilicon compound is provided which has the general formula (R.sup.1)3 Si—X—NR.sup.2—X.sup.1—NR.sup.22- In the formula: each R.sup.1 is selected from R and —OSi(R.sup.4)3, with the proviso that at least one R.sup.1 is —OSi(R.sup.4).sub.3; each R4 is selected from R, —OSi(R5)3, and —[OSiR2]mOSiR3; each R.sup.1 is selected from R, —OSi(R.sup.6).sub.3, and —[OSiR.sub.2].sub.mOSiR.sub.3; each R6 is selected from R and —[OSiR.sub.2].sub.mOSiR.sub.3; with the proviso that at least one of R.sup.4, R.sup.1 and R6 is —[OSiR.sub.2]mOSiR.sub.3; 0<m≤100. Each R is independently a substituted or unsubstituted hydrocarbyl group, e.g. a methyl group. Each of X and X.sup.1 is an independently selected divalent linking group, e.g. a divalent hydrocarbon linking group. Each R.sup.2 independently comprises a substituted or unsubstituted hydrocarbyl group, a polyether group, or H. At least one R.sup.2 comprises a polyether group. A method of preparing the branched organosilicon compound and a composition comprising the branched organosilicon compound are also provided.

A branched organosilicon compound is provided which has the general formula (R.sup.1)3 Si—X—NR.sup.2—X.sup.1—NR.sup.22- In the formula: each R.sup.1 is selected from R and —OSi(R.sup.4)3, with the proviso that at least one R.sup.1 is —OSi(R.sup.4).sub.3; each R4 is selected from R, —OSi(R5)3, and —[OSiR2]mOSiR3; each R.sup.1 is selected from R, —OSi(R.sup.6).sub.3, and —[OSiR.sub.2].sub.mOSiR.sub.3; each R6 is selected from R and —[OSiR.sub.2].sub.mOSiR.sub.3; with the proviso that at least one of R.sup.4, R.sup.1 and R6 is —[OSiR.sub.2]mOSiR.sub.3; 0<m≤100. Each R is independently a substituted or unsubstituted hydrocarbyl group, e.g. a methyl group. Each of X and X.sup.1 is an independently selected divalent linking group, e.g. a divalent hydrocarbon linking group. Each R.sup.2 independently comprises a substituted or unsubstituted hydrocarbyl group, a polyether group, or H. At least one R.sup.2 comprises a polyether group. A method of preparing the branched organosilicon compound and a composition comprising the branched organosilicon compound are also provided.