Constructional material
AssigneeBayer Aktiengesellschaft
InventorsWulf von Bonin, Ulrich von Gizycki, Kuno Wagner, Dietmar Schapel
Life of this patent
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Abstract
The present invention relates to a constructional material which is stable in storage and which is kept under moisture-free conditions and which comprises a substrate and a reactive one-component system which hardens on exposure to air by reaction with moisture. The present invention also relates to a process for the production of a constructional material which is stable in storage.
Claims30
A flexible, workable bandaging or medical material which is stable in storage when kept under moisture-free conditions and which forms a cross-linked rigid self-supporting structure free of extensive foaming upon exposure to sufficient moisture comprising a flexible substrate impregnated or coated with a reactive one-component system consisting essentially of the free isocyanate group bearing reaction products of polyisocyanates selected from the group consisting of
- phenylene-1,3-diisocyanate, phenylene-1,4-diisocyanate, mixtures of phenylene-1,3- and -1,4-diisocyanate, tolylene-2,4-diisocyanate, tolylene-2,6-diisocyanate, mixtures of tolylene-2,4- and -2,6-diisocyanate, diphenylmethane-2,4'-diisocyanate, diphenyl- methane-4,4'-diisocyanate, mixtures of diphenylmethane-2,4'- and -4,4'-diisocyanate, naphthylene-1,5-diisocyanate, triphenylmethane-4,4',4"-triisocyanate, polyphenyl-poly- methylene polyisocyanates obtained by aniline-formaldehyde condensation followed by phosgenation, with compounds which contain at least two hydrogen atoms that are reactive with isocyanates selected from the group consisting of polyesters, polyethers, polythioethers, polyacetals, polycarbonates, polyurethanes, polyureas, polyester amides, low molecular weight polyhydroxyl compounds and water.
A process for producing a flexible, workable bandaging or medical splinting material which is stable is storage when kept under moisture-free conditions and which forms a cross-linked rigid self-supporting structure free of extensive foaming upon exposure to sufficient moisture comprising impregnating or coating a flexible substrate under moisture free conditions with a reactive one-component system consisting essentially of the free isocyanate group bearing reaction products of polyisocyanates selected from the group consisting of
- phenylene-1,3-diisocyanate, phenylene-1,4-diisocyanate, mixtures of phenylene-1,3-and -1,4-diisocyanate, tolylene-2,4-diisocyanate, tolylene-2,6-diisocyanate, mixtures of tolylene-2,4- and -2,6- diisocyanate, diphenylmethane-2,4'-diisocyanate, diphenylmethane-4,4'-diisocyanate, mixtures of diaphenylmethane-2,4'-and -4,4'-diisocyanate naphthylene-1,5-diisocyanate, triphenylmethane-4,4',4"-triisocyanate polyphenyl-polymethylene polyisocyanates obtained by aniline-formaldehyde condensation followed by phosgenation, with compounds which contain at least two hydrogen atoms that are rective with isocyanates selected from the group consisting of polyesters, polyethers, polythioethers, polyacetals, polycarbonates, polyurethanes, polyureas, polyester amides low molecular weight polyhydroxyl compounds and water and subsequently packaging said flexible treated substrate in an air-tight and moisture-free container.
A flexible, workable medical splinting or bandaging material enclosed in a moisture-free and moisture-impervious package which is stable in storage and which forms a cross-linked rigid self-supporting planar or hollow structure free of extensive foaming after forming upon exposure to sufficient moisture comprising a flexible substrate impregnated or coated with a reactive one-component system selected from the group consisting of
- (a) organic compounds with molecular weights no greater than about 10,000 and containing SiOR-groups, where R is a C.sub.1 -C.sub.18 alkyl, a C.sub.4 -C.sub.14 cyclo- alkyl or a phenyl group, which hydrolyze upon exposure to atmospheric moisture and
- (b) the free isocyanate group bearing reaction products of polyisocyanates selected from the group consisting of
- phenylene-1,3-diisocyanate, phenylene-1,4diisocyanate, mixtures of phenylene-1,3- and -1,4-diisocyanate, tolylene-2,4-diisocyanate, tolylene-2,6-diisocyanate, mixtures of tolylene-2,4- and -2,6-diisocyanate, diphenylmethane-2,4'-diisocyanate, diphenyl- methane-4,4'-diisocyanate, mixtures of diphenylmethane-2,4'-and -4,4'-diisocyanate, naphthylene-1,5-diiisocyanate, triphenylmethane-4,4',4"-triisocyanate, polyphenyl-poly- methylene polyisocyanates obtained by aniline-formaldehyde condensation followed by phosgenation, with compounds which contain at least two hydrogen atoms that are reactive with isocyanates selected from the group consisting of polyesters, polyethers, polythioethers, polyacetals, polycarbonates, polyurethanes, polyureas, polyester amides, low molecular weight polyhydroxyl compounds and water.
A flexible, workable bandaging or medical splinting material which is stable in storage when kept under moisture-free conditions and which forms a cross-linked rigid self-supporting structure free of extensive foaming upon exposure to sufficient moisture comprising a flexible substrate impregnated or coated with a reactive one-component system containing no oxycarbonyl isocyanate groups comprising the free isocyanate group bearing reaction product of a polyisocyanate with a compound which contains at least two hydrogen atoms that are reactive with isocyanate groups.
A flexible, workable bandaging or splinting material which is storage stable in the absence of moisture and which cures to form a cross-linked rigid structure free of extensive foaming in the presence of atmospheric moisture comprising a flexible substrate impregnated or coated with a free isocyanate group bearing reaction product of a polyisocyanate and a compound which contains at least two hydrogen atoms that are reactive with isocyanate groups, said reaction product containing a catalyst for the reaction of isocyanates with moisture in an amount sufficient to give it a hardening time suitable for a substitute for plaster of paris splinting or bandaging materials and being free of oxycarbonyl isocyanate groups.
A medical splinting or bandaging material comprising a flexible, workable substrate impregnated or coated with a reactive system consisting essentially of the free isocyanate group bearing reaction product of an aromatic polyisocyanate and a compound which contains at least two hydrogen atoms that are reactive with isocyanate groups, said reaction product being so formulated that:
- (a) it is free of oxycarbonyl isocyanate groups;
- (b) it has a viscosity below 50,000 cP at 20.degree. C.;
- (c) it contains less than about 1% by weight of volatile components which can be removed by evaporation at 12 Torr and 20.degree. C. in one hour;
- (d) said impregnated or coated flexible substrate remains stable and flexible in the absence of moisture;
- (e) it will render said impregnated or coated flexible substrate into a cross-linked rigid self-supporting structure free of extensive foaming after forming into a planar or hollw configuration by reaction with water.
A process of forming a planar or hollow cross-linked rigid, self-supporting medical splint or bandage comprising;
- (a) impregnating or coating a flexible substrate with a free isocyanate group bearing reaction product of an aromatic polyisocyanate with a compound which contains at least two free hydrogen atoms that are reactive with isocyanate groups, said reaction product being storage stable in the absence of moisture, being free pf oxycarbonyl groups;
- containing less than about 1% by weight of volatile components which can be removed by evaporation at 12 Torr and 20.degree. C. in one hour;
- and having a viscosity below 50,000 cP at 20.degree. C.;
- (b) shaping said impregnated or coated flexible substrate to the desired configuration about the portion of the body to be supported or immobilized;
- and
- (c) reacting said free isocyanate groups with water to yield said cross-linked rigid structure free of extensive foaming.
A process of forming a planar or hollow cross-linked, rigid self-supporting medical splint or bandage comprising:
- (a) impregnating or coating a flexible substrate with organic compounds with molecular weights no greater than about 10,000 and containing SiOR-groups, where R is a C.sub.1 -C.sub.18 alkyl, a C.sub.4 -C.sub.14 cycloalkyl or a phanyl group, which hydrolyze upon exposure to atomspheric moisture, said compounds being storage stable in the absence of moisture;
- (b) shaping said impregnated or coated flexible substrate to the desired configuration about the portion of the body to be supported or immobilized;
- and
- (c) reacting said organic compounds with water to yield said cross-linked rigid structure.
A medical splinting or bandaging material comprising a flexible, workable substrate impregnated or coated with a reactive system consisting essentially of the free isocyanate group bearing reaction product of:
- (a) a polyisocyanate based on the phosgenation product of an aniline formaldehyde condensation;
- and
- (b) a polyether containing at least two hydroxyl groups;
- which contains a sufficient amount of a catalyst for the reaction of isocyanate groups with moisture to give it a hardening time suitable for a substitute for plaster of paris splinting or bandaging materials, said reaction product being so formulated that:
- (c) it contains less than about 1% by weight of volatile components which can be removed at 12 Torr and 20.degree. C. in one hour;
- (d) said impregnated or coated flexible substrate remains formable in the absence of moisture;
- and
- (e) it will render said impregnated or coated flexible substrate into a cross-linked rigid self-supporting structure of comparable mechanical strength to plaster of paris materials free of extensive foaming by reaction with water after forming into a planar or hollow configuration.
A flexible workable medical splinting or bandaging material enclosed in a moisture-free and moisture impervious package which is stable in storage and which forms a cross-linked rigid self-supporting planar or hollow structure of mechanical strength comparable to plaster of paris materials free of extensive foaming after forming upon exposure to sufficient moisture comprising a flexible substrate impregnated or coated with a reactive one component system consisting essentially of the free isocyanate group bearing reaction product of:
- (a) a polyisocyanate based on the phosgenation product of an aniline formaldehyde condensation;
- and
- (b) a polyether containing at least two hydroxyl groups;
- said reaction product being so formulated that:
- (c) it contains less than about 1% by weight of volatile compounds which can be removed at 12 Torr and 20.degree. C. in one hour;
- said impregnated or coated flexible substrate remains formable in the absence of moisture;
- and
- (e) it contains sufficient catalyst for the reaction of isocyanate groups with moisture to give it a hardening time suitable for a substitute for plaster of paris splinting or bandaging materials.
A flexible, workable medical splinting or bandaging material enclosed in a moisture-free and moisture-impervious package which is stable in storage and which forms a cross-linked rigid self-supporting planar or hollow structure of comparable mechanical strength to plaster of paris materials free of extensive foaming after forming upon exposure to sufficient moisture comprising a flexible substrate impregnated or coated with a reactive one-component system consisting essentially of the free isocyanate group bearing reaction product of:
- (a) an aromatic polyisocyanate;
- and
- (b) a polyhydroxyl compound containing at least two hydroxyl groups;
- said reaction product being so formulated that
- (c) it contains less than about 1% by weight of volatile compounds which can be removed at 12 Torr and 20.degree. C. in one hour;
- (d) said impregnated or coated flexible substrate remains formable in the absence of moisture;
- and
- (e) it contains sufficient catalyst for the reaction of isocyanate groups with moisture to give it a hardening time suitable for a substitute for plaster of paris splinting or bandaging materials.
Dependencies are inferred from the claim text.