# US 5,350,630 A · Repulpable securing devices

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- Number: US 5,350,630 A
- Document ID: US5350630A
- Status: Granted
- Kind: A
- Application number: 07/926,907
- Filed: 1992-08-07
- Granted: 1994-09-27
- Earliest claimed: 1991-06-24
- Assignees: Minnesota Mining and Manufacturing Company
- Inventors: Steven A. Schreiner; Karen M. Albertson; Mary L. Brown; Camille M. Hildebrandt; Lacy M. Hurlocker; Glenn C. Webster
- Web page: https://patentgrep.com/patent/US5350630A

## CPC

- B65D 65/466: {Bio- or photodegradable packaging materials}
- B29B 17/0005: {Direct recuperation and re-use of scrap material during moulding operation, i.e. feed-back of used material}
- B65D 63/10: Non-metallic straps, tapes, or bands; Filamentary elements, e.g. strings, threads or wires; Joints between ends thereof
- B29K 2029/04: {PVOH, i.e. polyvinyl alcohol (B29K2031/04 takes precedence)}
- B29K 2031/04: {Polymers of vinyl acetate, e.g. PVAc, i.e. polyvinyl acetate}
- Y02W 30/62: Plastics recycling; Rubber recycling
- Y10T 428/28: Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T 428/283: Water activated
- Y10T 428/2852: Adhesive compositions
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to repulpable securing devices for securing repulpable articles. The securing devices are preferably in the form of straps or tapes made from extruded sheets of polyvinylalcohol or rope from extruded fibers of polyvinylalcohol. The securing devices are wrapped around pulpable articles for example, bales of pulp sheets, to hold them securely bound during transit or storage. They may also be used in machine thread-up or turn-up operations or as a handle for repulpable articles. The securing devices have the combination of properties of high tensile strength and repulpability at cold and hot water repulp temperatures. The securing devices can be repulped along with repulpable bales. These devices replace conventional wire or plastic strap which must be separately removed and disposed of, for example, at landfill sites.

## Claims

### Claim 1

A repulpable pressure sensitive adhesive tape, comprising:
a) a backing of a thermally extruded, longitudinally oriented sheet of plasticized polyvinyl alcohol, said extruded polyvinyl alcohol having a degree of hydrolysis between about 70 and 95% and a degree of crystallinity between about 10 and 45%, and having the property of being repulpable at, at least one temperature between about 0.degree. C. (32.degree. F.) and repulp boiling temperatures, and
b) a repulpable pressure sensitive adhesive on at least one surface of said backing,
wherein said tape has a break tensile strength of at least 8.27.times.10.sup.7 Newtons/m.sup.2 (12,000 psi).

### Claim 2 (depends on 1)

A repulpable pressure sensitive adhesive tape according to claim 1 wherein said polyvinyl alcohol has the repeating unit represented by the formula: ##STR3## wherein R is selected from the group consisting of hydrogen and methyl;
R.sup.1 is a C.sub.6 -C.sub.18 hydrocarbyl group;
y is 0 to 30 mole %;
z is 0.5 to 8 mole %; and
x is 70 to 99.5 mole %.