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1. WO2020002042 - PACKAGING ADHESIVES BASED ON RENEWABLE RAW MATERIALS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims:

1. An adhesive composition comprising:

a) at least one polyester polyol based on betulin; and

b) at least one NCO-terminated compound.

2. The adhesive composition according to claim 1 , characterized in that the polyester polyol based on betulin is obtained by reacting betulin and one or more triglycerides.

3. The adhesive composition according to one or more of the preceding claims, characterized in that the polyester polyol is obtained from a reaction mixture that comprises the following monomer units:

i) betulin in an amount of from 5 to 50 wt.%, preferably 25 to 35 wt.%;

ii) dicarboxylic acid in an amount of from 5 to 45 wt.%, preferably 8 to 40 wt.%; and

iii) triglyceride in an amount of from 20 to 80 wt.%, preferably 40 to 70 wt.%,

in each case based on the total weight of the monomer units.

4. The adhesive composition according to one or more of the preceding claims, characterized in that the dicarboxylic acid is selected from the group consisting of succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanoic acid, tetradecandioic acid, furandicarboxylic acid, isophthalic acid, terephthalic acid, orthophthalic acid and mixtures thereof.

5. The adhesive composition according to claim 3, characterized in that the triglyceride is selected from the group consisting of soybean oil, linseed oil, sunflower oil, safflower oil, rapeseed oil, physic nut oil, light walnut oil, grapeseed oil, canola oil, corn oil, cashew kernel oil, fish oil, castor oil, tall oil, coconut oil, palm oil, palm kernel oil, olive oil and mixtures thereof and derivatives thereof as well as synthetic or biotechnologically prepared triglycerides.

6. The adhesive composition according to one or more of the preceding claims, characterized in that the NCO-terminated compound is selected from the group consisting of 1 ,5- naphthylene diisocyanate (NDI), 2,4‘- or 4,4‘-diphenylmethane diisocyanate (MDI), isomers of toluene diisocyanate (TDI), methylene triphenyl triisocyanate (MIT), hydrogenated MDI (H12MDI), tetramethylxylylene diisocyanate (TMXDI), 1-isocyanatomethyl-3-isocyanato- 1 ,5,5-trimethylcyclohexane (IPDI), xylylene diisocyanate (XDI), hexane- 1 ,6-diisocyanate (HDI), pentamethylene diisocyanate (PDI), dicyclohexylmethane diisocyanate and mixtures thereof.

7. The adhesive composition according to one or more of the preceding claims, characterized in that the proportion of polyester polyol based on betulin is 20 to 90 wt.%, preferably 30 to 80 wt.%, particularly preferably 40 to 60 wt.%, in each case based on the total weight of the solvent-free adhesive composition.

8. The adhesive composition according to one or more of the preceding claims, characterized in that the proportion of NCO-terminated compound is 10 to 80 wt.%, preferably 20 to 70 wt.%, particularly preferably 30 to 60 wt.%, in each case based on the total weight of the solvent-free adhesive composition.

9. The adhesive composition according to one or more of the preceding claims, characterized in that the composition has a ratio of NCO:OH of from 1 to 5, preferably 1.2 to 3.

10. The adhesive composition according to one or more of the preceding claims, characterized in that the proportion of critical migratable components in the composition is less than 300 ppm, preferably less than 200 ppm, particularly preferably less than 50 ppm, in each case based on the total weight of the solvent-free adhesive composition.

1 1. A method for preparing an adhesive composition according to one or more of claims 1 to 10, comprising the following steps:

a)providing a mixture comprising betulin and at least one triglyceride;

b)reacting the reaction product obtained from the mixture in step a) with an NCO-terminated compound.

12. An adhesive obtainable by curing an adhesive composition according to one or more of claims 1 to 10.

13. The use of an adhesive composition according to one or more of claims 1 to 10 or an adhesive according to claim 12 as a laminating adhesive.

14. An article comprising an adhesive composition according to one or more of claims 1 to 10 or an adhesive according to claim 12.

15. A method for bonding at least two substrates, characterized in that an adhesive composition according to one or more of claims 1 to 10 is applied to at least one substrate and the at least two substrates are subsequently joined together.