Method for molding a body in a mold

Patent metadata

Field	Value
Publication number	US-9914859-B2
Application number	US-201515326891-A
Country	US
Kind code	B2
Filing date	Jul 14, 2015
Priority date	Jul 31, 2014
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

Method for molding a body in a mold, comprising the following steps: applying an adhesive tape to the inside of a mold, distributing the layers of material forming the body over the adhesive tape, curing the layers of material, removing the body from the mold, where the adhesive tape has a backing on one side of which a self-adhesive has been applied in the form of a polymer mixture, the polymers being constructed of 60 to 99.5 wt % of n-butyl acrylate and/or 2-ethylhexyl acrylate, 0.5 to 10 wt % of an ethylenically unsaturated monomer having an acid or acid-anhydride function, 0 to 30 wt % of one or more olefinic monomers and the self-adhesive comprises between 0 and 60 parts by weight of one or more tackifiers.

First claim

The invention claimed is:

1. Method for molding a body in a mold,
comprising the following steps:
application of an adhesive tape to the inside of a mold,
distribution of the material layers forming the body on the adhesive tape,
curing the material layers, and
removal of the body from the mold,

wherein the adhesive tape has a carrier film, on one side of which a self-adhesive compound is applied in the form of a polymer mixture, wherein the polymers are composed of the following:
(a) 60 to 99.5 wt. % of n-butyl acrylate and/or 2-ethylhexyl acrylate,
(b) 0.5 to 10 wt. % of an ethylenically unsaturated monomer with an acid or acid anhydride functional group, and
(c) 0 to 30 wt. % of one or a plurality of (a) various olefin monomers,
and the self-adhesive compound contains 0 to 60 parts by weight of one or a plurality of tackifiers based on the mass of the polymer mixture.

2. Method according to claim 1 ,
wherein (a) comprises
a mixture of 2-ethylhexyl acrylate and n-butyl acrylate.

3. Method according to claim 1 ,
wherein
monomer (b) is acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid and/or maleic acid anhydride.

4. Method according to claim 1 , wherein
the monomers (c) are selected from the group consisting of alkyl(meth)acrylates, other than the monomers forming (a), C 1 to C 10 hydroxyalkyl(meth)acrylates, and unsaturated hydrocarbons with 2 to 8 carbon atoms.

5. Method according to claim 1 , wherein
the polymers are composed of
a) 75 to 94 wt. % of n-butyl acrylate and/or 2-ethylhexyl acrylate,
b) 1 to 5 wt. % of an ethylenically unsaturated monomer with an acid or acid anhydride functional group, and
c) 5 to 20 wt. % of one different olefin monomer or a plurality of different olefin monomers.

6. Method according to claim 1 , wherein
the polymers are composed of
a) 87 to 94 wt. % of n-butyl acrylate and/or 2-ethylhexyl acrylate,
b) 1 to 3 wt. % of an ethylenically unsaturated monomer with an acid or acid anhydride functional group, and
c) 5 to 10 wt. % of one or a plurality of (a) different olefin monomers.

7. Method according to claim 1 , wherein
the self-adhesive compound contains 15 to 50 parts by weight of one or a plurality of tackifiers based on the mass of the polymer mixture.

8. Method according to claim 1 , wherein
films composed of PUR, PE, PP, PET or PA are used as carrier films.

9. Method according to claim 1 , wherein
the carrier film contains one or at least two fluoropolymers.

10. Method according to claim 9 , wherein
the carrier film contains up to 50 wt. % of one or at least two fluoropolymers based on the total composition of the carrier film or the polymers making up the carrier film are composed up to 100% of one or at least two fluoropolymers.

11. Method according to claim 9 , wherein as fluoropolymers, PTFE (polytetrafluoroethylene), ETFE (poly(ethylene-co-tetrafluoroethylene)), FEP (poly(tetrafluoroethylene-co-hexafluoropropylene)), PVF (polyvinyl fluoride), PCTFE (polychlorotrifluoroethylene), ECTFE (poly(ethylene-co-chlorotrifluoroethylene), PVDF (poly(1,1-difluorethene)), PFA (perfluoroalkoxy polymers), or mixtures of two or more of the aforementioned fluoropolymers are used.

12. Method according to claim 11 , wherein
the fluoropolymers are mixed with further polymers.

13. Method according to claim 1 , wherein the thickness of the carrier film is 15 to 350 μm.

14. Method according to claim 1 , wherein the carrier film is composed of an at least two-layered laminate comprising two or more film layers.

15. Method according to claim 1 , wherein the carrier film is composed of at least two film layers, wherein the two outer film layers are of different colors.

16. Method according to claim 1 , wherein the mass of the adhesive compound applied to the carrier film is 10 to 200 g/m 2 .

17. Method according to claim 1 , wherein the inside of the mold is equipped with a release agent before application of the adhesive tape.

18. Method according to claim 1 , wherein curing of the material layers is carried out in a vacuum.

19. Method according to claim 3 , wherein monomer b is acrylic acid, methacrylic acid or a mixture thereof.

Assignees

• Tesa Se

Inventors

• Bernt Stephan
• Kerep Patrick

Classifications

• C09J7/22 Primary

  Plastics; Metallised plastics · CPC title

• B29K2627/18

  PTFE, i.e. polytetrafluoroethylene {, e.g. ePTFE, i.e. expanded polytetrafluoroethylene} · CPC title

• C09J2423/106

  in the substrate · CPC title

• B29K2033/04

  Polymers of esters · CPC title

• C09J7/38

  Pressure-sensitive adhesives [PSA] · CPC title