1. and Polyester modified with polyethylene glycol and pentaerythritol, Wellman Inc, WO patent 0012 793 (2000).
2. and High draw ratio polyester feed yarn and its draw texturing, Monsanto Co, US patent 4 092 299 (1978).
3. Reactive modification of polyethylene terephthalate with polyepoxides
4. High melt strength PET polymers for foam applications and methods relating thereto, Du Pont de Nemours Company, US patent 5 229 432 (1993).
5. and Melt modification of PET with glycidyl compounds as reactive additives, ANTEC 2001, Dallas USA, 8th May (2001).