Compostable adhesive

A compostable adhesive comprising a solution of 1 to 70% by weight, with respect to the polymer constituent, of biodegradable polymers selected from the group consisting of thermoplastic aliphatic or partially aromatic polyester urethanes, aliphatic or aliphatic-aromatic polyester carbonates and aliphatic or partially aromatic polyester amides, wherein

• a) the aliphatic or partially aromatic polyester urethanes are prepared by reacting an ester component prepared from starting materials selected from the group consisting of:
• A) alcohol components selected from the group consisting of aliphatic bifunctional alcohols;
• cycloaliphatic bifunctional alcohols;
• monomeric or oligomeric polyols based on ethylene glycol, propylene glycol, tetrahydrofuran or copolymers thereof with molecular weights up to 4000 daltons and mixtures thereof;
• and optional small amounts of components selected from the group consisting of branched bifunctional alcohols, higher-functional alcohols and mixtures thereof;
• and
• acid components selected from the group consisting of aliphatic bifunctional acids, aromatic bifunctional acids and mixtures thereof;
• and optional small amounts of higher-functional acids;
• B) from units functionalized by both acid and alcohol, their derivatives and mixtures thereof;
• and
• combinations of A and B selected from the group consisting of a mixture, a copolymer and a mixture thereof,
• wherein the aromatic acids make up not more that 50 wt. % of all acids;
• with
• C) functional monomers selected from the group consisting of aliphatic bifunctional isocyanates, cycloaliphatic bifunctional isocyanates, and mixtures thereof,
• optional higher-functional isocyanates;
• optional linear, branched or cycloaliphatic bifunctional alcohols;
• linear, branched or cycloaliphatic higher functional alcohols;
• and mixtures thereof;
• optional linear, branched or cycloaliphatic bifunctional amines;
• linear, branched or cycloaliphatic higher functional amines and mixtures thereof,
• optional amino alcohols, higher functional amino alcohols and mixtures thereof;
• and
• optional other modified amines or alcohols,
• wherein the ester component is at least 75 wt. % of the sum of the ester component and C;
• b) aliphatic or aliphatic-aromatic polyester carbonates prepared by reacting as starting material, an ester or a mixture thereof as described in (a) with
• D) a carbonate fraction selected from the group consisting of 1) aromatic bifunctional phenols and carbonate donors;
• 2) aliphatic esters of carbonic acid or derivatives thereof, or aliphatic carboxylic acids or derivatives thereof and carbonate donors;
• and 3) mixtures thereof,
• wherein the ester component is at least 70% wt. % of the sum of the ester component and D;
• c) the aliphatic or partially aromatic polyester amides are prepared by reacting as starting materials, an ester or a mixture thereof as described in (a) with an amide component selected from the group consisting of
• E) an amide fraction of an amine component selected from the group consisting of aliphatic bifunctional amines, cycloaliphatic bifunctional amines, and mixtures thereof;
• and
• optional small amounts of branched bifunctional amines, higher-functional amines or mixture thereof;
• and
• an acid component selected from the group consisting of linear bifunctional acids, cycloaliphatic bifunctional acids, aromatic bifunctional acids, and mixtures thereof;
• and
• optional small amounts of branched bifunctional acids, higher-functional acids, and mixtures thereof;
• F) an amide fraction of compounds containing both amine and acid moieties;
• and mixtures thereof,
• wherein the ester component is at least 30 wt. % of the sum of the ester component and the amide component,
• and wherein all acids are optionally derivatized as moieties selected from the group consisting of acid chlorides, monomeric esters and oligomeric esters.