US5811566A — Process for purifying a polyether

Claim 1

Independent Claim 210 words

A process for purifying a terminally unsaturated group-containing polyether (A) containing as an impurity a first salt attributable to catalyst employed in the preparation of the polyether or attributable to catalyst or other compounds employed in the modification of the polyether, which comprises adding to the polyether (A) an acid (C), which is capable of reacting with a first salt to form a second salt which is essentially insoluble in the polyether (A), and water (B) within the range of 0.05 to 50 wt % of added water based on the polyether (A), stirring the mixture of (A), (B) and (C) to at least partially dissolve the first salt and to form the second salt, then removing essentially all of the water from the mixture, thereafter adding an adsorbent to the mixture and filtering the mixture to remove the second salt and the adsorbent, wherein the polyether (A) is an unsaturated group-containing polyether obtained by reacting a monoepoxide to an initiator in the presence of a metal catalyst to obtain a hydroxyl group-containing polyether, then converting the hydroxyl group-containing polyether to an alkali metal alkoxide, followed by reacting an unsaturated group-containing halogenated hydrocarbon thereto, and further a surfactant (D) is added together with the water (B) and the compound (C).

Claim 2

Dependent Claim 210 words

A process for purifying a terminally unsaturated group-containing polyether (A) containing as an impurity a first salt attributable to catalyst employed in the preparation of the polyether or attributable to catalyst or other compounds employed in the modification of the polyether, which comprises adding to the polyether (A) an acid (C), which is capable of reacting with a first salt to form a second salt which is essentially insoluble in the polyether (A), and water (B) within the range of 0.05 to 50 wt % of added water based on the polyether (A), stirring the mixture of (A), (B) and (C) to at least partially dissolve the first salt and to form the second salt, then removing essentially all of the water from the mixture, thereafter adding an adsorbent to the mixture and filtering the mixture to remove the second salt and the adsorbent, wherein the polyether (A) is an unsaturated group-containing polyether obtained by reacting a monoepoxide to an initiator in the presence of a metal catalyst to obtain a hydroxyl group-containing polyether, then converting the hydroxyl group-containing polyether to an alkali metal alkoxide, followed by reacting an unsaturated group-containing halogenated hydrocarbon thereto, and further a surfactant (D) is added together with the water (B) and the compound (C).

Claim 3

Dependent Claim 22 words

The purification process according to claim 1, wherein a surfactant (D) is added together with the water (B) and the acid (C).

Claim 4

Dependent Claim 14 words

The purification process according to claim 1, wherein the acid (C) is disodium dihydrogenpyrophosphate.

Claim 5

Dependent Claim 35 words

The purification process according to claim 1, wherein the polyether (A) is a hydroxyl group-containing polyether obtained by reacting a monoepoxide to an initiator in the presence of a metal catalyst, or its modified product.

Claim 6

Dependent Claim 29 words

The purification process according to claim 4, wherein the metal catalyst is a double metal cyanide complex compound catalyst, a porphyrin metal complex compound catalyst and/or an alkali catalyst.

Claim 7

Dependent Claim 29 words

The purification process according to claim 5, wherein the metal catalyst is a double metal cyanide complex compound catalyst, a porphyrin metal complex compound catalyst and/or an alkali catalyst.

Claim 8

Dependent Claim 20 words

The purification process according to claim 1, wherein the first salt contains a zinc salt and an alkali metal salt.

Claim 9

Dependent Claim 172 words

A process for producing a hydrolyzable group-containing silicon group-containing polyether, which comprises adding to a polyether (A-1) containing a first salt, water (B) and an acid (C) which is capable of reacting with an ion constituting the first salt to form a second salt which is essentially insoluble in the polyether (A-1), then removing substantially all the water from the mixture, followed by adding an adsorbent and removing the second salt and adsorbent from the polyether (A-1) by filtration to purify the polyether (A-1), and then reacting thereto a silicon compound (E) containing a silicon atom to which a hydrogen atom and a hydrolyzable group are directly bonded, in the presence of a catalyst comprising a Group 8 metal or its compound, wherein the polyether (A-1) is an unsaturated group-containing polyether obtained by reacting a monoepoxide to an initiator in the presence of a metal catalyst to obtain a hydroxyl group-containing polyether, then converting the hydroxyl group-containing polyether to an alkali metal alkoxide, followed by reacting an unsaturated group-containing halogenated hydrocarbon thereto.

Claim 10

Dependent Claim 172 words

A process for producing a hydrolyzable group-containing silicon group-containing polyether, which comprises adding to a polyether (A-1) containing a first salt, water (B) and an acid (C) which is capable of reacting with an ion constituting the first salt to form a second salt which is essentially insoluble in the polyether (A-1), then removing substantially all the water from the mixture, followed by adding an adsorbent and removing the second salt and adsorbent from the polyether (A-1) by filtration to purify the polyether (A-1), and then reacting thereto a silicon compound (E) containing a silicon atom to which a hydrogen atom and a hydrolyzable group are directly bonded, in the presence of a catalyst comprising a Group 8 metal or its compound, wherein the polyether (A-1) is an unsaturated group-containing polyether obtained by reacting a monoepoxide to an initiator in the presence of a metal catalyst to obtain a hydroxyl group-containing polyether, then converting the hydroxyl group-containing polyether to an alkali metal alkoxide, followed by reacting an unsaturated group-containing halogenated hydrocarbon thereto.

Claim 11

Dependent Claim 44 words

The purification process according to claim 1, comprising the further step of adding a solvent in which the second salt is insoluble to dilute the mixture after addition of the solvent and filtering the resulting mixture to remove the second salt and the adsorbent.

Claim 12

Dependent Claim 51 words

The purification process according to claim 8, comprising the further step of adding a solvent in which the second salt is insoluble after addition of the adsorbent to dilute the mixture for the filtration of the mixture followed by filtering the diluted mixture to remove the second salt and the adsorbent.

Claim 13

Dependent Claim 28 words

The purification process according to claim 1, wherein the compound (C) is an acid pyrophsophate or a combination of an acid pyrophosphate with hydrochloric acid and/or sulfuric acid.

Claim 14

Dependent Claim 21 words

The purification process according to claim 1, wherein the polyether to be purified contains a zinc salt or an alkali salt.

Claim 15

Dependent Claim 27 words

The process according to claim 8, wherein the compound (C) is an acid pyrophosphate or a combination of an acid pyrophosphate with hydrochloric acid and/or sulfuric acid.

Claim 16

Dependent Claim 20 words

The process according to claim 8, wherein the polyether to be purified contains a zinc salt or an alkali salt.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-09-21	2002-03-23	2002-09-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-09-21	2006-03-23	2006-09-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-09-21	2010-03-23	2010-09-22	$7700.00	Window Closed / Lapsed

Process for purifying a polyether

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag