Tape and products containing the same

Patent metadata

Field	Value
Publication number	US-10767290-B2
Application number	US-201113993854-A
Country	US
Kind code	B2
Filing date	Dec 13, 2011
Priority date	Dec 14, 2010
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

The invention relates to a fibrous tape comprising fused polymeric fibers, said fibrous tape having a tape thickness and a tape width and being characterized by a coefficient of variation (CV) of the tape thickness across the tape width of at most 6%.

First claim

The invention claimed is:

1. A fibrous tape comprising fused polymeric fibers, wherein at least 75 mass % of the fused polymeric fibers are oriented so as to be substantially in parallel along a common direction, and wherein
the polymeric fibers have a fiber length and abutting ones of the polymeric fibers are fused to each other over an abutting length of at least 50% of the fiber length, and wherein
the fibrous tape has a tape thickness from 1 μm to 200 μm, a tape width, and a coefficient of variation (CV) of the tape thickness across the tape width of at most 6%, wherein the CV of the tape thickness is calculated by:
(i) obtaining a cross section of the tape by embedding the tape in epoxy resin and cutting slices of the embedded tape-resin system;
(ii) selecting an enlargement using a microscope such that the width of the tape is equal to about 40 times the thickness of the tape;
(iii) taking 5 measurements of the local thickness of the tape, evenly distributed across the width of the tape; and
(iv) dividing the standard deviation of the 5 measurements by the average of the 5 measurements.

2. The tape of claim 1 , wherein the CV of the tape thickness across the tape width is at most 3%.

3. The tape of claim 1 , wherein the ratio of width to thickness of the tape is at least 5:1.

4. The tape of claim 1 , wherein the width of the tape is between 1 mm and 2000 mm.

5. The tape of claim 1 , wherein the polymeric fibers are polyolefin fibers.

6. The tape of claim 5 , wherein the polyolefin fibers are polyethylene fibers.

7. The tape of claim 5 , wherein the polyolefin fibers are ultrahigh molecular weight polyethylene ([U]HMWPE) fibers.

8. The tape of claim 1 , wherein the tensile strength of the polymeric fibers is at least 1.2 GPa.

9. The tape of claim 1 , wherein the tensile modulus of the polymeric fibers is at least 5 GPa.

10. The tape of claim 1 , wherein the tape has a tensile strength of at least 1 GPa.

11. The tape of claim 1 , wherein the tape has a tensile modulus of at least 60 GPa.

12. A panel comprising a stack of two or more sheets comprising monolayers which include a fibrous tape of claim 1 .

13. A product comprising a fibrous tape of claim 1 , wherein the product is selected from the group consisting of automotive products, marine products, aerospace products, life-protection products and architectural products.

14. The product according to claim 13 , wherein the product is a product for ships, boats, marine panels, planes, helicopters, aerospace panels, body armor, ballistic vests, ballistic shields, ballistic helmets, ballistic vehicle protection, windows, doors, walls, cargo doors, cargo walls, radomes and shields.

15. A process for the manufacturing of a tape according to claim 1 , comprising the steps of:
(a) providing a plurality of polymeric fibers having a melting temperature Tm;
(b) forming a layer comprising a network of polymeric fibers;
(c) introducing the layer into a nip of a calendar and calendaring the layer with a calendaring line-pressure of at least 100 N/mm, at a temperature of below Tm of the polymeric fibers to form a tape comprising fused polymeric fibers; and
(d) cooling the tape.

16. The process of claim 15 , wherein step (d) includes cooling the tape to room temperature.

17. The process according to claim 15 , wherein the plurality of polymeric fibers are in the form of an ordered parallel array.

18. The process according to claim 15 , wherein step (b) comprises forming the layer comprising an abutting and unidirectionally aligned network of the polymeric fibers.

19. The process according to claim 18 , wherein the polymeric fibers forming the abutting and unidirectionally aligned network of the layer are grouped into a plurality of yarns, each yarn having a titer of at least 220 dtex.

Assignees

• Marissen Roelof
• Van Putten Koen
• Verspagen Antoon Maria
• Dsm Ip Assets Bv

Inventors

• Marissen Roelof
• Van Putten Koen
• Verspagen Antoon Maria

Classifications

• D04H3/045

  for net manufacturing · CPC title

• B32B5/26

  another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)} · CPC title

• D04H3/14

  with bonds between thermoplastic yarns or filaments produced by welding · CPC title

• D04D9/00 Primary

  Ribbons, tapes, welts, bands, beadings, or other decorative or ornamental strips, not otherwise provided for (made by laminating B32B; binders for packaging purposes B65D; adhesive tape C09J7/20; made by weaving D03; made by braiding D04C) · CPC title

• F41H5/0485

  all the layers being only fibre- or fabric-reinforced layers · CPC title