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US4130517A Expired / Lapsed US ⏱️ 0.0 years remaining

Multiphase block and graft copolymers comprising a hydrophilic continuous phase and hydrophobic domains

Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1977-03-21
•
Granted: 1978-12-19
•
Expires: 1997-03-21
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Abstract

Abstract This invention relates to thermoplastic, multiphase copolymers selected from the group consisting of copolymers represented by graft copolymers having the general formula <IMAGE> AND BLOCK COPOLYMERS HAVING THE GENERAL FORMULA XB-[AB]n-yA wherein n is an integer >/=1, m is >1, and y are 0 or 1, and y is 1 when n is 1, A is a thermoplastic, hydrophobic polymer block having a softening point (i.e., a glass transition or crystalline melting point) of at least 35 DEG C and a molecular weight of at least 2,000, and B is a thermoplastic, hydrophilic polymer block having a softening point of at least about 35 DEG C and a molecular weight of at least about 6,000, which comprises from about 30-97 wt % of said copolymer. The novel polymers of this invention are useful for making water containing gels. Preferably, the thermoplastic multiphase copolymer is a styrene-ethylene oxide copolymer. The novel polymers are made by a process which allows one to prepare a copolymer which is substantially free of homopolymeric impurities. The compositions of the instant invention are melt processable by conventional thermoplastic techniques.

Inventors

  • 👤 Robert D. Lundberg
  • 👤 Neville G. Thame

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 00:09
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C08G81/024; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/62; C08G18/6204; C08G81/021; C08K; C08K3/00; C08K3/18; C08K3/20; C08G2210/00; C08G2250/00; C08G2310/00

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 122 words
A water swollen gel composition which consists of: (a) a thermoplastic block copolymer having an average molecular weight of at least 10,000, said block copolymer having the general formula XB--[AB] n --yA wherein n is an integer ≧1, X and y are 0 or 1, and y is 1 when n is 1, A is a thermoplastic hydrophobic polymer block having a softening point of at least about 35° C. and a molecular weight of at least about 2,000, and B is a thermoplastic hydrophilic polymer block having a molecular weight of at least 6,000 which comprises from about 30-97 wt. % of said copolymer; and (b) about 30 to about 98 wt. % of water based on the water swollen gel.
Claim 2
Dependent Claim 122 words
A water swollen gel composition which consists of: (a) a thermoplastic block copolymer having an average molecular weight of at least 10,000, said block copolymer having the general formula XB--[AB] n --yA wherein n is an integer ≧1, X and y are 0 or 1, and y is 1 when n is 1, A is a thermoplastic hydrophobic polymer block having a softening point of at least about 35° C. and a molecular weight of at least about 2,000, and B is a thermoplastic hydrophilic polymer block having a molecular weight of at least 6,000 which comprises from about 30-97 wt. % of said copolymer; and (b) about 30 to about 98 wt. % of water based on the water swollen gel.
Claim 3
Dependent Claim 48 words
The composition of claim 1 wherein B is selected from the group consisting of poly(ethylene oxide), polyacrylamide, poly-α-hydroxyethylmethacrylate and copolymers thereof wherein the hydrophilic portion is greater than 50%, and A is selected from the group consisting of polystyrene, poly(t-butyl styrene), polyvinyl toluene, polymethylmethacrylate, polyamides and copolymers thereof.
Claim 4
Dependent Claim 18 words
The composition of claim 2 wherein said copolymer has a molecular weight of from about 25,000 to 500,000.
Claim 5
Dependent Claim 23 words
The composition of claim 3 wherein said A block and said B block have a softening point of from 35° to 260° C.
Claim 6
Dependent Claim 19 words
The composition of claim 4 wherein said A block is a polyamide and the B block is polyethylene oxide.
Claim 7
Dependent Claim 20 words
The composition of claim 4 wherein said A block is a polystyrene and said B block is a polyethylene oxide.

References Cited (Backward Citations)

US3050511A Cited
US3257476A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-12-18 1982-06-19 1982-12-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-12-18 1986-06-19 1986-12-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-12-18 1990-06-19 1990-12-19 $7700.00 Window Closed / Lapsed

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