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Foam insulation (polyurethane)
Polyurethane manufacturing history and stages of development
In 1937, 
ءئءءءءءءءءOd colleagues in Leverkusen, Germany, manufactured polyurethane for the first time.
The new polymers had some advantages over the existing plastics that were manufactured by polymerizing olefins or by condensation polymers.
But it did not fall under the patents that Wallace Hume Carothers obtained for making polyester.
Emphasis was placed on the early business of producing fibers, elastic foams, and polyurethane on a limited scale as aircraft coatings during World War II.

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