§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4275244A Expired / Lapsed US ⏱️ 0.0 years remaining

Linear polyalkylene ether glycols of high molecular weight

Assignee: BASF Corp
•
Filing: 1979-07-13
•
Granted: 1981-06-23
•
Expires: 1999-07-13
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Linear polypropylene ether glycols of high molecular weight are made by reacting a linear polypropylene ether glycol of lower molecular weight first with an alkaline agent such as sodium hydroxide or other suitable base to form an alcoholate, and then coupling the alcoholate with a suitable difunctional coupling agent, such as the benzene-sulfonic acid diester of ethylene glycol or with some other suitable arylsulfonic acid diester of a C 2 to C 6 alcohol, thereby obtaining a 100 percent linear polypropylene ether glycol of a desirably higher molecular weight. Materials so produced find use in an aqueous medium as defoaming agents, thickeners, or emulsifiers, and use as protective colloids to improve the low-temperature stability of polyurethane and other latices.

Inventors

  • 👤 Herbert Helfert
  • 👤 Pauls Davis

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 22:40
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/334; C08G65/3344; C08G65/331; C08G65/3311; C08G65/3314; C08G65/3315; C08G65/3317; C08G65/34; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/02

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 130 words
A composition of matter of the structural formula: X--(Y--X).sub.n --Y--X wherein X is the residue of a polypropylene ether glycol of linear character and of a molecular weight of up to about 2,000, upon removal of a terminal --OH group therein, Y is the residue of an aliphatic or alkylaromatic diol upon removal of two --OH groups there from, having the generalized formula: ##STR4## wherein n is an integer of from 1 to 3, or a poly(methylene glycol) having the generalized formula: ##STR5## wherein m is an integer of from 2 to 6 and R is hydrogen, methyl, ethyl, phenyl or glycidol (--CH 2 --O--R') in which R' is phenyl, butenyl, or mixtures thereof, n is such that the molecular weight of the molecule is about 3,500 to about 100,000.
Claim 2
Dependent Claim 130 words
A composition of matter of the structural formula: X--(Y--X).sub.n --Y--X wherein X is the residue of a polypropylene ether glycol of linear character and of a molecular weight of up to about 2,000, upon removal of a terminal --OH group therein, Y is the residue of an aliphatic or alkylaromatic diol upon removal of two --OH groups there from, having the generalized formula: ##STR4## wherein n is an integer of from 1 to 3, or a poly(methylene glycol) having the generalized formula: ##STR5## wherein m is an integer of from 2 to 6 and R is hydrogen, methyl, ethyl, phenyl or glycidol (--CH 2 --O--R') in which R' is phenyl, butenyl, or mixtures thereof, n is such that the molecular weight of the molecule is about 3,500 to about 100,000.
Claim 3
Dependent Claim 28 words
A composition as defined in claim 1, wherein said glycol is polypropylene ether glycol of about 1,000 molecular weight, said diol is triethylene glycol, and n is 2.

References Cited (Backward Citations)

US2839477A Cited
US2425845A Cited
US2481278A Cited
US2839476A Cited
US3036118A Cited
US3053903A Cited
US3057892A Cited
US3082172A Cited
US3334147A Cited
US3535307A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-06-22 1984-12-22 1985-06-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-06-22 1988-12-22 1989-06-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-06-22 1992-12-22 1993-06-23 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag