US4768503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric composition
Assignee: Bros and Walsh Ltd
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Filing: 1985-08-01
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Granted: 1988-09-06
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Expires: 2005-08-01
Abstract
Abstract A polymeric composition is disclosed which has sealant and preferably also adhesive properties and which is suitable for use as a protective dressing for application to the skin. The composition comprises a chemically cross-linked hydrophilic polymer and a support matrix such as a high molecular weight hydrophobic polymer. The hydrophilic polymer is a water-swellable polymer which absorbs or adsorbs water but which is water-insoluble. The composition preferably includes a tackifyer which may be provided by a low molecular weight fraction of a hydrophobic matrix or by a distinct adhesive component such as a gum or a low molecular weight polymer. The composition is particularly suitable for use as a sealing ring in conjunction with a post-surgical drainage appliance wherein the hydrophilic polymer is incorporated in a form such as to provide a transmission system for liquid.
Inventors
- 👤 Donald J. Highgate
- 👤 John D. Frankland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:17
CPC Classifications
A; A61; A61L; A61L24/00; A61L24/04; A61L24/06; A61L2400/00; A61L2400/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
A protective dressing suitable for application to the skin which comprises a hydrophilic polymeric composition consisting essentially of (i) from 30 to 70 percent by weight of at least one chemically cross-linked hydrophilic polymer selected from the group consisting of: (a) homopolymers of hydrophilic monomers selected from the group consisting of vinyl lactams, hydroxy-alkyl acrylates, hydroxy-alkyl methacrylates, acrylamide, methacrylamide, N-substituted derivatives of acrylamide, N-substituted derivatives of methacrylamide; (b) copolymers of at least two of the said hydrophilic monomers; and (c) copolymers of at least one of the said hydrophilic monomers with at least one hydrophobic monomer (ii) a support matrix for the said hydrophilic polymer, wherein the said support matrix comprises at least one hydrophobic polymer having a viscosity average molecular weight of 100,000 to 150,000.
Claim 2
Dependent Claim
126 words
A protective dressing suitable for application to the skin which comprises a hydrophilic polymeric composition consisting essentially of (i) from 30 to 70 percent by weight of at least one chemically cross-linked hydrophilic polymer selected from the group consisting of: (a) homopolymers of hydrophilic monomers selected from the group consisting of vinyl lactams, hydroxy-alkyl acrylates, hydroxy-alkyl methacrylates, acrylamide, methacrylamide, N-substituted derivatives of acrylamide, N-substituted derivatives of methacrylamide; (b) copolymers of at least two of the said hydrophilic monomers; and (c) copolymers of at least one of the said hydrophilic monomers with at least one hydrophobic monomer (ii) a support matrix for the said hydrophilic polymer, wherein the said support matrix comprises at least one hydrophobic polymer having a viscosity average molecular weight of 100,000 to 150,000.
Claim 3
Dependent Claim
22 words
A protective dressing according to claim 1, wherein a portion of the said chemically cross-linked hydrophilic polymer is replaced by a hydrocolloid.
Claim 4
Dependent Claim
23 words
A protective dressing according to claim 1, wherein the said chemically cross-linked hydrophilic polymer is a copolymer of methyl methacrylate and N-vinyl pyrrolidone.
Claim 5
Dependent Claim
28 words
A protective dressing according to claim 1, wherein the said high molecular weight hydrophobic polymer is polyisobutylene having a viscosity average molecular weight of between 120,000 and 130,000.
Claim 6
Dependent Claim
133 words
A protective dressing suitable for application to the skin which comprises a polymeric composition consisting essentially of (i) at least one chemically cross-linked hydrophilic polymer which is a copolymer of at least one hydrophobic monomer with at least one hydrophilic monomer selected from the group consisting of vinyl lactams, hydroxyalkyl acrylates, hydroxyalkyl methacrylates, acrylamide, methacrylamide, N-substituted derivatives of acrylamide and N-substituted derivatives of methacrylamide; (ii) support matrix for the said hydrophilic polymer comprising at least one hydrophobic polymer having a viscosity average molecular weight of 100,000 to 150,000; and (iii) a tackifier comprising a low molecular weight polymer having a viscosity average molecular weight of from 200 to 30,000, said low molecular weight polymer being derived from the same monomer as that from which the hydrophobic polymer of the support matrix is derived.
Claim 7
Dependent Claim
133 words
A protective dressing suitable for application to the skin which comprises a polymeric composition consisting essentially of (i) at least one chemically cross-linked hydrophilic polymer which is a copolymer of at least one hydrophobic monomer with at least one hydrophilic monomer selected from the group consisting of vinyl lactams, hydroxyalkyl acrylates, hydroxyalkyl methacrylates, acrylamide, methacrylamide, N-substituted derivatives of acrylamide and N-substituted derivatives of methacrylamide; (ii) support matrix for the said hydrophilic polymer comprising at least one hydrophobic polymer having a viscosity average molecular weight of 100,000 to 150,000; and (iii) a tackifier comprising a low molecular weight polymer having a viscosity average molecular weight of from 200 to 30,000, said low molecular weight polymer being derived from the same monomer as that from which the hydrophobic polymer of the support matrix is derived.
Claim 8
Dependent Claim
111 words
A protective dressing suitable for application to the skin which comprises a polymeric composition consisting essentially of (i) at least one chemically cross-linked hydrophilic polymer which is a copolymer of at least one hydrophobic monomer with at least one hydrophilic monomer selected from the group consisting of vinyl lactams, hydroxyalkyl acrylates, hydroxy-alkyl methacrylates, acrylamide, methacrylamide, N-substituted derivatives of acrylamide and N-substituted derivatives of methacrylamide; (ii) a support matrix for the said hydrophilic polymer comprising at least one hydrophobic polymer having a viscosity average molecular weight of 100,000 to 150,000 and (iii) a tackifier comprising a distinct component or mixture of components having a viscosity average molecular weight of 200 to 30,000.
Claim 9
Dependent Claim
111 words
A protective dressing suitable for application to the skin which comprises a polymeric composition consisting essentially of (i) at least one chemically cross-linked hydrophilic polymer which is a copolymer of at least one hydrophobic monomer with at least one hydrophilic monomer selected from the group consisting of vinyl lactams, hydroxyalkyl acrylates, hydroxy-alkyl methacrylates, acrylamide, methacrylamide, N-substituted derivatives of acrylamide and N-substituted derivatives of methacrylamide; (ii) a support matrix for the said hydrophilic polymer comprising at least one hydrophobic polymer having a viscosity average molecular weight of 100,000 to 150,000 and (iii) a tackifier comprising a distinct component or mixture of components having a viscosity average molecular weight of 200 to 30,000.
Claim 10
Dependent Claim
59 words
A protective dressing according to claim 6 wherein the support matrix (ii) comprises polyisobutylene having a viscosity average molecular weight of between 120,000 and 130,000 and wherein the tackifier (iii) comprises polyisobutylene having a viscosity average molecular weight within the range of 6,000 and 20,000 and a viscosity within the range of 180,000 to 220,000 SSU at 98.9° C.
Claim 11
Dependent Claim
145 words
A sealing ring for use with a post-surgical drainage appliance comprising a bag or pouch adapted to receive drainage from the body of a patient via a stoma, fistula, lesion, or the like, the ring having an opening to permit the ring to surround the stoma, fistula, lesion, or the like thereby forming a seal between the skin of a patient and the drainage appliance and which ring is formed from a protective dressing suitable for application to the skin which comprises a polymeric composition consisting essentially of (i) at least one chemically cross-linked hydrophilic polymer which is a copolymer of at least one hydrophobic monomer with at least one hydrophilic monomer selected from the group consisting of vinyl lactams, hydroxyalkyl acrylates, hydroxyalkyl methacrylates, acrylamide, methacrylamide, N-substituted derivatives of acrylamide and N-substituted derivatives of methacrylamide; and (ii) a support matrix for the said hydrophilic polymer.
Claim 12
Dependent Claim
145 words
A sealing ring for use with a post-surgical drainage appliance comprising a bag or pouch adapted to receive drainage from the body of a patient via a stoma, fistula, lesion, or the like, the ring having an opening to permit the ring to surround the stoma, fistula, lesion, or the like thereby forming a seal between the skin of a patient and the drainage appliance and which ring is formed from a protective dressing suitable for application to the skin which comprises a polymeric composition consisting essentially of (i) at least one chemically cross-linked hydrophilic polymer which is a copolymer of at least one hydrophobic monomer with at least one hydrophilic monomer selected from the group consisting of vinyl lactams, hydroxyalkyl acrylates, hydroxyalkyl methacrylates, acrylamide, methacrylamide, N-substituted derivatives of acrylamide and N-substituted derivatives of methacrylamide; and (ii) a support matrix for the said hydrophilic polymer.
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