chieee老太亂伦tube,你懂得网,免费人成无码大片在线观看,婷婷无套内射影院

News

Development history of polyurethane materials in developed countries

Release time:[2017-09-26] hit:

In 1959 DuPont was successful in the production of polyether polyurethane elastic fibers, grades Lycra (Lycra).

1960 American Rubber Company made of polyester-based polyurethane elastic fiber, grade for Vinyl (Vyrene). In the case of

June 1963 DuPont research success Polyurethane synthetic leather, its appearance and feel similar to natural leather, grade for Corfam (Corfam).

Polyether polyol polyurethanes were realized in 1967.


The last information::Ibid  The next information:History of Polyurethane Materials