378 letter to Hogan Howe 13-4-15 patent number US 3650213 A - polyunethane

why would they want to make non-lethal weapons out of polyunethane and I all so have to confess that I do not understand the why or if I have read it right

2008

is this polyurthane

13-4-15-0127

13-4-15-0128

13-4-15-0141