IP Library › Granted Patent US 12,305,088
Granted Patent B2
US 12,305,088 · App. 18/075,086 · Granted May 20, 2025

Waterproof seams and methods of making the same

Inventors: Ka Chun Lao (Tai Po New Town, HK); Wing Kin Lam (Kwun Tong, HK); Chang Hsien Wu (Taichung, TW)
Assignee: Bemis Associates, Inc.
C09J7/29B32B5/02B32B7/14B32B37/1292C09J7/30B32B2305/18B32B2307/402B32B2307/7265B32B2405/00C09J2203/358C09J2400/263C09J2467/006C09J2475/00
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Quick Facts
Patent No.
US 12,305,088
App. No.
18/075,086
Granted
May 20, 2025
Kind
B2
Abstract

Disclosed herein are improved waterproof seam tapes and methods of producing the same.

Claims (16)

1. A method of manufacturing a waterproof seam tape, comprising:

a. preparing a fabric package comprising adhering a polyester fabric to a waterproof membrane;

b. transferring a color or pattern to the polyester fabric of the fabric package;

c. laminating an adhesive composition comprising at least one polyurethane dispersion, a polyurethane powder, a polyurethane dispersing agent, and a thickener, onto the waterproof membrane of the fabric package, thereby forming a waterproof three-layer tape; and

d. slitting the waterproof three-layer tape into a waterproof seam tape.

2. The method of claim 1 , wherein the adhesive composition further comprises a crosslinker.

3. The method of claim 2 , wherein the crosslinker is an isocyanate crosslinker.

4. The method of claim 1 , wherein the polyester fabric is adhered to the waterproof membrane with a glue.

5. The method of claim 4 , wherein the glue is a PUR glue.

6. The method of claim 1 , wherein the adhesive composition is about 7 mil.

7. The method of claim 1 , wherein the fabric package is cured for at least 24 hours after transferring a color pattern to the polyester fabric.

8. The method of claim 1 , wherein the waterproof seam tape is cured for at least 24 hours after laminating the adhesive composition onto the waterproof membrane.

9. The method of claim 1 , wherein the waterproof three-layer tape is slit using log slitting or center slitting.

10. The method of claim 1 , wherein the waterproof membrane comprises a thermoplastic resin.

11. The method of claim 1 , wherein the waterproof membrane has a softening point of about 220° C.

12. The method of claim 1 , wherein the color or pattern is transferred to the polyester fabric at a temperature between 180° C. and 200° C.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 3, 2023
From: LAO, KA CHUN; LAM, WING KIN; WU, CHANG HSIEN
To: BEMIS ASSOCIATES, INC.
Reel/Frame 062586/0940 →
Continuity (2)
Provisional Application 63292260 · Dec 21, 2021
Related Publication 20230193085A1 · Jun 22, 2023
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