Two-component lamination adhesive of renewable origin
AssigneeBostik SA
InventorsOlivier Laferte, Stephane Fouquay
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Abstract
Two-component lamination adhesive, having a —NCO component obtained by reacting a polyisocyanate with a composition of diols, a multilayer film comprising an adhesive layer composed of said lamination adhesive, a process for the preparation of said film, and use of said film in the manufacture of flexible packagings.
Claims17
A two-component lamination adhesive comprising an —NCO component and an —OH component, wherein the —NCO component is obtained by reacting, according to a polyaddition reaction, a stoichiometric excess of an aromatic or aliphatic polyisocyanate (A) with a composition (B) formed of diols comprising, on the basis of the total weight of said composition:
- from 60 to 100% by weight of a composition (B1) comprising one or more di(polyricinoleate) diols having a hydroxyl number NOH of between 30 and 70 mg KOH/g and formula (I):
- in which:
- A represents a divalent hydrocarbon radical optionally interrupted by one or more oxygen or sulfur heteroatoms;
- m and n, which are identical or different, represent 0 or an integer ranging from 1 to 11 and are such that m+n varies from 0 to 11;
- and
- from 0 to 40% by weight of a composition (B2) comprising diols having an NOH of between 72 and 360 mg KOH/g and which are:
- dimerized fatty alcohols comprising from 20 to 44 carbon atoms, or
- di(polyricinoleate) diols having formula (II):
- in which:
- B represents a radical as defined above for A which is identical to or different from the radical represented by A;
- p and q, which are identical or different, represent 0 or an integer ranging from 1 to 3 and are such that p+q varies from 0 to 3.
A two-component lamination adhesive comprising an —NCO component and an —OH component, wherein the —NCO component is obtained by reacting, according to a polyaddition reaction, a stoichiometric excess of an aromatic or aliphatic polyisocyanate (A) with a composition (B) formed of diols comprising, on the basis of the total weight of said composition:
- from 60 to 100% by weight of a composition (B1) comprising one or more di(polyricinoleate) diols having a hydroxyl number NOH of between 30 and 70 mg KOH/g and formula (I):
- in which:
- A represents a divalent hydrocarbon radical optionally interrupted by one or more oxygen or sulfur heteroatoms;
- m and n, which are identical or different, represent 0 or an integer ranging from 1 to 11 and are such that m+n varies from 0 to 11;
- and
- from 0 to 40% by weight of a composition (B2) comprising diols having an NOH of between 72 and 360 mg KOH/g and which are:
- dimerized fatty alcohols comprising from 20 to 44 carbon atoms, or
- di(polyricinoleate) diols having formula (II):
- in which:
- B represents a radical as defined above for A which is identical to or different from the radical represented by A;
- p and q, which are identical or different, represent 0 or an integer ranging from 1 to 3 and are such that p+q varies from 0 to 3, wherein the —NCO component is obtained by reacting, according to a polyaddition reaction, an aromatic or aliphatic polyisocyanate (A) with a composition formed of diols (B), in an amount of (A) and (B) corresponding to a —NCO/—OH equivalent ratio of between 2 and 10.
Dependencies are inferred from the claim text.