US 12,409,613 B2
Process for the preparation of a bonded structure, a bonded structure and use of said bonded structure for preparing an automotive part
Jana Hrachova, Sittard (NL); Sander Knauf, Landgraaf (NL); Barbara Dordi, Bergen op Zoom (NL); and Hans Leenders, Bergen op Zoom (NL)
Assigned to SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
Appl. No. 17/783,302
Filed by SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
PCT Filed Dec. 18, 2020, PCT No. PCT/EP2020/087024
§ 371(c)(1), (2) Date Jun. 8, 2022,
PCT Pub. No. WO2021/123167, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 19218666 (EP), filed on Dec. 20, 2019.
Prior Publication US 2023/0024134 A1, Jan. 26, 2023
Int. Cl. B29C 65/00 (2006.01); B29K 23/00 (2006.01); B29K 309/08 (2006.01); B29L 31/30 (2006.01)
CPC B29C 66/028 (2013.01) [B29C 66/71 (2013.01); B29C 66/7212 (2013.01); B29C 66/919 (2013.01); B29K 2023/06 (2013.01); B29K 2023/12 (2013.01); B29K 2309/08 (2013.01); B29L 2031/3008 (2013.01); B29L 2031/3044 (2013.01); B29L 2031/3058 (2013.01)] 11 Claims
 
1. A process for the preparation of a bonded structure comprising at least a first plastic part having a first bonding surface, said process comprising the steps of:
a) treating at least part of a first bonding surface of said first plastic part with a flame of a propane gas, wherein, during treatment with a flame of the propane gas, a flame is produced by burning a mixture consisting of air and the propane gas, and optionally one or more of methane, ethane, butane, pentane, and hexane, wherein the gas-to-air ratio is chosen such that the propane gas to oxygen volume ratio is from 1:4.50 to less than 1:5.01 to obtain a first plastic part having a flame-treated first bonding surface,
wherein the first plastic part comprises polypropylene and 0 to 5% of an additive wherein the polypropylene is not blended with another polymer, and
b1) providing a second plastic part, wherein the second plastic part has a second bonding surface and
c1) contacting said first and second bonding surfaces with a bonding agent together by contacting at least part of the flame-treated first bonding surface and at least part of said second bonding surface with said bonding agent.