Adhesive tape for protecting surfaces

Patent metadata

Field	Value
Publication number	US-10125293-B2
Application number	US-201515317703-A
Country	US
Kind code	B2
Filing date	Jun 11, 2015
Priority date	Jun 11, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

The invention relates to an extensively biologically degradable adhesive tape, which in particular has a good and quickly established anchoring between the adhesive and the carrier. The invention relates to an adhesive tape for protecting surfaces, comprising an adhesive H, containing at least 60 wt %, at least one polyurethane P, obtainable from chemical cross-linking of a polyurethane pre-polymer, obtainable from the chemical reaction of d) one or a plurality of aliphatic polyester polyols A having a hydroxy functionality of 1.8 through 2 and a number-averaged molecular weight of equal to/greater than 1,000 g/mole; e) one or a plurality of compounds B having a hydroxy functionality of 1.8 through 2 and a number-averaged molecular weight of less than 1,000 g/mol; f) one or a plurality of aliphatic diisocyanates C; wherein the ratio of the total number of isocyanate groups to the total number of hydroxy groups of the substances involved in the chemical reaction for building the prepolymer is greater than/equal to 0.4 and less than 1; and a biodegradable carrier.

First claim

The invention claimed is:

1. An adhesive tape for protecting surfaces, comprising:
a pressure-sensitive adhesive H comprising at least 60 wt % of at least one polyurethane P obtained by chemical crosslinking of a polyurethane prepolymer obtained by chemical reaction of a mixture of reactants comprising:
a) one or more aliphatic polyester polyols A having a hydroxy functionality of from 1.8 up to and including 2 and a number-average molecular weight of greater than or equal to 1000 g/mol;
b) one or more compounds B having a hydroxy functionality of from 1.8 up to and including 2 and a number-average molecular weight of less than 1000 g/mol;
c) one or more aliphatic diisocyanates C;

where the ratio of the total number of isocyanate groups to the total number of hydroxy groups in said mixture of reactants is greater than or equal to 0.4 and less than 1; and
a biodegradable carrier.

2. The adhesive tape as claimed in claim 1 , wherein the ratio of the total number of the isocyanate groups to the total number of hydroxy groups in the mixture of reactants is greater than or equal to 0.75 and less than 1.

3. The adhesive tape as claimed in claim 1 , wherein the biodegradable carrier comprises at least one polyester PolEs which is formed from a monomer composition MonZ consisting of
at least one C 2 to C 12 alkanediol and
at least one dicarboxylic acid selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, 2-methylglutaric acid, 3-methylglutaric acid, α-ketoglutaric acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, brassilic acid, fumaric acid, 2,2-dimethylglutaric acid, suberic acid, diglycolic acid, oxalacetic acid, glutamic acid, aspartic acid, itaconic acid, maleic acid, and terephthalic acid

or which is a polycaprolactone.

4. The adhesive tape as claimed in claim 3 , wherein the monomer composition MonZ consists of
butanediol as the at least one C 2 to C 12 alkanediol and
at least one member selected from the group consisting of adipic acid, terephthalic acid, and succinic acid as the at least one dicarboxylic acid.

5. The adhesive tape as claimed in claim 3 , wherein the biodegradable carrier comprises at least 40 wt % of polyester PolEs, based on the total weight of the biodegradable carrier.

6. The adhesive tape as claimed in claim 1 , wherein the biodegradable carrier consists, of polybutylene succinate, a butanediol-adipic acid-terephthalic acid copolymer, or a blend of a butanediol-adipic acid-terephthalic acid copolymer and polylactic acid.

7. The adhesive tape as claimed in claim 1 , wherein the chemical crosslinking to form the polyurethane P takes place by reaction of the polyurethane prepolymer with at least one polyisocyanate D having three or more isocyanate groups.

8. A method comprising bonding a material with an adhesive tape, wherein the adhesive tape is an adhesive tape as claimed in claim 1 .

Assignees

• Tesa Se

Inventors

• Strebl Maike
• Kerep Patrick
• Blömker Tobias
• Klingeberg Kerstin

Classifications

• C09J2201/122

  Chemistry & Metallurgy · mapped topic

• C08G18/664

  with compounds of group C08G18/3203 · CPC title

• C08G18/4238

  derived from dicarboxylic acids and dialcohols · CPC title

• C08G2170/40

  Compositions for pressure-sensitive adhesives · CPC title

• C09J175/06 Primary

  from polyesters · CPC title