EP0384404A1
Expired / Lapsed
EP
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Polyisocyanate bonding agents for laminate films
Assignee: MINISTERO DELL' UNIVERSITA' E DELLA RICERCA SCIENT
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Filing: 1990-02-20
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Granted: —
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Expires: 2010-02-20
Abstract
Abstract Described are polyisocyanate adhesives modified with aliphatic hydroxycarboxylic acids or anhydrides, useful in the production of laminates made from plastic, metallized or metal films and resistant to the conditions of pasteurization.
Inventors
- 👤 Giuseppe Pizzigoni
- 👤 Angelo Porra'
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 16:43
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; B32B15/00; B32B15/04; B32B27/00; B32B27/06; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/6692
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
14 words
Polyisocyanate adhesives modified with at least one aliphatic hydroxycarboxylic acid or a corresponding anhydride.
Claim 2
Dependent Claim
14 words
Polyisocyanate adhesives modified with at least one aliphatic hydroxycarboxylic acid or a corresponding anhydride.
Claim 3
Dependent Claim
51 words
Adhesives according to claim 1, wherein the at least one aliphatic hydroxycarboxylic acid, or anhydride thereof, contains a total number of OH and COOH groups not exceeding 6 and is preferably selected from citric acid, malic acid, tartaric acid, gluconic acid, dimethylol propionic acid, lactic acid, tartronic acid and citramalic acid.
Claim 4
Dependent Claim
65 words
Adhesives according to any one of the preceding claims, having an average content of NCO groups of from about 1% to about 10% by weight relative to the dry matter, a viscosity of from about 1000 to about 8000 mPas at about 50°C, and a content of modifier in the range of from about 0.025 to about 2% by weight, relative to the dry matter.
Claim 5
Dependent Claim
55 words
Process for preparing the modified polyisocyanate adhesives according to any one of claims 1 to 3, wherein at least one polyether-polyol and/or at least one polyester-polyol is reacted with at least one polyisocyanate in the presence of at least one aliphatic hydroxycarboxylic acid or anhydride thereof as defined in anyone of claims 1 and 2.
Claim 6
Dependent Claim
31 words
Process according to claim 4 wherein the polyester-polyol and/or polyether-polyol is a linear or branched aliphatic polyester-polyol and/or polyether-polyol having an average molecular weight of from about 400 to about 4000.
Claim 7
Dependent Claim
28 words
Process according to any one of claims 4 and 5, wherein the polyisocyanate is selected from aliphatic and/or aromatic polyisocyanates containing 2 or 3 NCO groups per molecule.
Claim 8
Dependent Claim
28 words
Process according to any one of claims 4 to 6, wherein the hydrocycarboxylic acid is fed to the reactor in metered amounts together with the polyether-polyol and/or polyester-polyol.
Claim 9
Dependent Claim
41 words
Process according to any one of claims 4 to 7, wherein the hydroxycarboxylic acid is used in an amount of from 0.025 to about 2% by weight, preferably from 0.05 to 1%, based on the total weight of polyol and polyisocyanate.
Claim 10
Dependent Claim
21 words
Process according to any one of claims 4 to 8, wherein the temperature employed ranges from about 30°C to about 150°C.
Claim 11
Dependent Claim
32 words
Multilayer laminates made from films of plastic materials and/or from metallized films and/or from metal films, produced by use of the polyisocyanate adhesives according to any one of claims 1 to 3.
References Cited (Backward Citations)
DE1694079A1
Cited
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