Solvent stable slip additive composition

Patent metadata

Field	Value
Publication number	US-11267976-B2
Application number	US-202017427982-A
Country	US
Kind code	B2
Filing date	Apr 16, 2020
Priority date	Apr 25, 2019
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A composition contains a polyorganosiloxane dispersed in a combination of a condensation product of a polysiloxane resin and a polyoxyalkylene polymer, and a non-aqueous fluid carrier; wherein the weight-ratio of non-aqueous fluid carrier to condensation product is 0.5 or more and 10 or less; the weight-ratio of the combination of condensation product and non-aqueous fluid carrier to polyorganosiloxane is 0.01 or more and 0.50 or less; and wherein the composition contains less than one weight-part aromatic solvent per million weight parts composition.

First claim

What is claimed is:

1. A composition comprising a dispersion comprising:
(a) a polyorganosiloxane comprising at least 90 mole-percent dimethyl D units and having a viscosity of 1,000,000 centipoise or more at 25 degrees Celsius, the polyorganosiloxane being in the form of particles having an average size of 0.5 to 20 micrometers;
(b) a condensation product of:
(i) a polysiloxane resin having a weight-average molecular weight of 4,000-50,000 and having the following composition:
(R 3 SiO 1/2 ) a (SiO 4/2 ) b (ZO 1/2 ) c
where subscripts a, b and c refer to the average molar ratio of the group associated with the subscript relative to total moles of silicon atoms in the molecule, subscript a is 0.30-0.60, subscript b is 0.40-0.70, subscript c is 0.05-0.20, the sum of subscripts a and b is one, R is independently in each occurrence selected from a group consisting of hydrogen, alkyl and aryl groups containing 1-30 carbon atoms, and Z is independently in each occurrence selected from a group consisting of H, and C 1 -C 8 alkyls; and

(ii) a polyoxyalkylene polymer having a number average molecular weight of 4,500 Daltons or more and at the same time 50,000 Daltons or less and having the following composition:
A-O—(C 2 H 4 O) e (C 3 H 6 O) p -A′

where subscripts e and p are the average number of (C 2 H 4 O) and (C 3 H 6 O) groups in the molecule respectively and the ratio e/p is greater than one and less than 9, A and A′ are independently selected from a group consisting of hydrogen, alkyl, substituted alkyl, aryl, and substituted aryl groups provided that at least one of A and A′ is H; and

(c) a non-aqueous fluid carrier that is miscible with the polyoxyalkylene polymer;
wherein the weight-ratio of non-aqueous fluid carrier (c) to condensation product (b) is 0.5 or more and 10 or less; the weight-ratio of the combination of condensation product (b) and non-aqueous fluid carrier (c) to polyorganosiloxane (a) is 0.01 or more and 0.50 or less; and the composition contains less than one weight-part aromatic solvent per million weight parts composition.

2. The composition of claim 1 , wherein the condensation product (b) comprises a first non-aromatic solvent having a boiling point in a range of 50-200 degrees Celsius at 101.325 kilopascals pressure and Hansen solubility parameter values of 15.0-22.6 (MPa) 1/2 for δ d , 2.8-7.0 (MPa) 1/2 for δ p and 4.0-7.5 (MPa) 1/2 for δ h .

3. The composition of claim 2 , wherein the condensation product (b) further comprises a second non-aromatic solvent having a boiling point in a range of 50-200 degrees Celsius at 101.325 kilopascals pressure and Hansen solubility parameter values of 12.2-18.7 (MPa) 1/2 for δ d , 0.0-1.7 (MPa) 1/2 for δ p and 0.0-3.4 (MPa) 1/2 for δ h , and a solubility of water that is less than 0.075 weight-percent based on weight of the second non-aromatic solvent.

4. The composition of claim 2 or claim 3 , wherein the first non-aromatic solvent and second non-aromatic solvent have combined Hansen solubility parameter values of 15.0-16.4 (MPa) 1/2 for δ d , 2.0-6.0 (MPa) 1/2 for δ p and 3.3-6.3 (MPa) 1/2 for δ h .

5. The composition of claim 2 , wherein the condensation product (b) contains less than five weight-parts aromatic solvent per million parts condensation product weight.

6. The composition of claim 1 , wherein the composition further comprises water at a concentration of up to 500 weight parts water per 100 weight parts of the polyorganosiloxane (a).

7. The composition of claim 1 , wherein both the condensation product (b) and the composition are free of tin catalyst.

8. The composition of claim 1 , further comprising an organic binder in combination with the polyorganosiloxane of component (a), the condensation product of component (b) and non-aqueous fluid carrier of component (c).

9. The composition of claim 1 , wherein the polyorganosiloxane has a terminal amine functionality.

10. A method for preparing the composition of claim 1 , the method comprising the steps of:
(a) preparing a condensation product by conducting a condensation reaction in a reaction solvent between:
(i) a polysiloxane resin having a weight-average molecular weight of 4,000-50,000 and having the following composition:
(R 3 SiO 112 ) a (SiO 4/2 ) b (ZO 1/2 ) c

where subscripts a, b and c refer to the average molar ratio of the group associated with the subscript relative to total moles of silicon atoms in the molecule, subscript a is 0.30-0.60, subscript b is 0.40-0.70, subscript c is 0.05-0.20, the sum of subscripts a and b is one, R in each occurrence is selected from a group consisting of hydrogen, alkyl and aryl groups containing 1-30 carbon atoms, and Z is in each occurrence selected from a group consisting of H, and C 1 -C 8 alkyls; and
(ii) a polyoxyalkylene polymer having a number average molecular weight of 4,500 Daltons or more and at the same time 50,000 Daltons or less and having the following composition:
A-O—(C 2 H 4 O) e (C 3 H 6 O) p -A′

where subscripts e and p are the average number of (C 2 H 4 O) and (C 3 H 6 O) groups in the molecule respectively and the value of e/p is greater than one and less than 9, A and A′ are independently selected from a group consisting of hydrogen, alkyl, substituted alkyl, aryl, and substituted aryl groups provided that at least one of A and A′ is H;

(b) adding to the condensation product a non-aqueous fluid carrier that is miscible with the polyoxyalkylene polymer to form a mixture;
(c) after step (a) and before step (d), removing reaction solvent to a concentration of less than 2 weight-percent relative to condensation reaction product weight, including removing any aromatic solvent to a concentration of less than 5 weight-parts per million weight parts of condensation product;
(d) dispersing into the mixture of step (c) a polyorganosiloxane comprising at least 90 mole-percent dimethyl D units and having a viscosity of 1,000,000 centipoise or more at 20 degrees Celsius under shear to produce a dispersion of polyorganosiloxane particles having an average size of 0.5 to 20 micrometers dispersed in the mixture of step (c) to form a composition;

wherein: the weight-ratio of non-aqueous fluid carrier added in step (b) to condensation product prepared in step (a) is 0.5 or more and 10 or less; the weight-ratio of the combination of condensation product prepared in step (a) and non-aqueous fluid carrier added in step (b) to polyorganosiloxane dispersed in step (d) is 0.01 or more and 0.5 or less; and the composition contains less than one weight-part aromatic solvent per million weight parts composition.

11. The process of claim 10 , wherein the condensation reaction is run in a first non-aromatic solvent having a boiling point in a range of 50-200 degrees Celsius at 101.325 kilopascals pressure and Hansen solubility parameter values of 15.0-22.6 (MPa) 1/2 or δ d , 2.8-7.0 (MPa) 1/2 for δ p and 4.0-7.5 (MPa) 1/2 for δ h .

12. The process of claim 11 , wherein the condensation reaction is run in a non-aromatic solvent comprising a blend of the first non-aromatic solvent and a second non-aromatic solvent having a boiling point in a range of 50-200 degrees Celsius at 101.325 kilopascals pressure and Hansen solubility parameter values of 12.5-18.7 (MPa) 1/2 for δ d , 0.0-1.5 (MPa) 1/2 for δ p and 0.0-3.4 (MPa) 1/2 for δ h and having a solubility of water that is less than 0.075 weight-percent based on weight of the second non-aromatic solvent; wherein the blend of first and second non-aromatic solvents has Hansen solubility parameter values of 15.0-16.4 (MPa) 1/2 for δ d , 2.0-6.0 (MPa) 1/2 for δ p and 3.3-6.3 (MPa) 1/2 for δ h .

Assignees

• Dow Silicones Corp

Inventors

• Fryfogle Patrick J
• Liu Yihan
• Mitchell Timothy P
• Reil Jennifer A
• Reiter Michael R
• Roberts John
• Wieber Gary M
• Zimmerman Brett L

Classifications

• C09D183/12

  containing polyether sequences · CPC title

• C08G77/16

  to hydroxy groups · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title

• C08G77/38

  Polysiloxanes modified by chemical after-treatment · CPC title

• C08L83/04

  Polysiloxanes · CPC title