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US 6,191,216 B1Granted
Hydrophilic, self-adhesive polyurethane gel substances
AssigneeBayer Aktiengesellschaft
InventorsOtto Ganster, Jörg Büchner, Jochen Werner Kenndoff, Günther Sachau
Life of this patent
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Abstract
The invention relates to improved hydrophilic, polyurethane gel substances and foams, the use of polyurethane gel substances for pressure-distributing, in particular self-adhesive polyurethane-(foam) gels, and the use of said polyurethane gel substances for moulded structures and adhesive coatings.
Claims7
Hydrophilic, self-adhesive polyurethane gel compositions prepared from
- a) polyether polyols with 2 to 6 hydroxyl groups and having OH values of 20 to 112 and an ethylene oxide (EO) content of ≧10 wt. %,
- b) anti-oxidants,
- c) bismuth(III) carboxylates soluble in the polyether polyols a) and based on carboxylic acids having 2 to 18 C atoms as catalysts together with
- d) hexamethylene diisocyanate or a modified hexamethylene diisocyanate,
- wherein the product of the functionalities of the polyurethane-forming components a) and d) is at least 5.2, the quantity of catalyst c) amounts to 0.005 to 0.25 wt. %, relative to the polyols a), the quantity of anti-oxidants b) is in the range of ≧0.1 wt. %, relative to the polyols a) and a ratio of free NCO groups in component d) to the free OH groups in component a) in the range from 0.30 to 0.70 is selected.
2 more elements
A moulding comprising a hydrophilic gel prepared from,
- A) polyether polyols with 2 to 6 hydroxyl groups and having OH values of 20 to 112 and an ethylene oxide (EO) content of ≧10 wt. %,
- B) anti-oxidants,
- C) bismuth(III) carboxylates soluble in the polyether polyols a) and based on carboxylic acids having 2 to 18 C atoms as catalysts together with,
- D) hexamethylene diisocyanate or a modified hexamethylene diisocyanate,
- wherein the product of the functionalities of the polyurethane-forming components a) and d) is at least 5.2, the quantity of catalyst c) amounts to 0.005 to 0.25 wt. % relative to the polyols a), the quantities of anti-oxidants b) is in the range of ≧0.1 wt. % relative to the polyols a) and the ratio of free NCO groups in component d) to the free OH groups in component a) is in the range from 0.30 to 0.70.
2 more elements
An adhesive layer comprising a hydrophilic gel prepared from,
- A) polyether polyols with 2 to 6 hydroxyl groups and having OH values of 20 to 112 and an ethylene oxide (EO) content of ≧10 wt. %,
- B) anti-oxidants,
- C) bismuth(III) carboxylates soluble in the polyether polyols a) and based on carboxylic acids having 2 to 18 C atoms as catalysts together with,
- D) hexamethylene diisocyanate or a modified hexamethylene diisocyanate,
- wherein the product of the functionalities of the polyurethane-forming components a) and d) is at least 5.2, the quantity of catalyst c) amounts to 0.005 to 0.25 wt. % relative to the polyols a), the quantities of anti-oxidants b) is in the range of ≧0.1 wt. % relative to the polyols a) and the ratio of free NCO groups in component d) to the free OH groups in component a) is in the range from 0.30 to 0.70.
2 more elements
Dependencies are inferred from the claim text.