ApplicationNo. 471766 filed on 05/20/1974
US Classes:521/57, Including step of surface coating a particle or process of expanding a surface coated particle428/407, Including synthetic resin or polymer521/88, Ingredient is ether, alcohol, or inorganic alcoholate, e.g., phenol, etc.521/91, Ingredient contains a silicon atom521/93, Metal atom is part of an organic compound521/98, Ingredient contains only C and H atoms, only C and halogen atoms, or only C, H, and halogen atoms524/394, Oxygen atom or metal atom DNRM, e.g., metal stearate, etc.524/447, Kaolin or bentonite524/451, Talc (soapstone) DNRM524/577, From aromatic hydrocarbon monomer525/185, With additional solid polymer derived from at least one nonethylenic reactant525/187Heterocyclic ring is an 1,2-epoxy ring
ExaminersPrimary: Briggs, Sr., Wilbert J.
Foreign Application Priority Data1973-05-21 IT
AbstractExpandable thermoplastic polymeric compositions based on styrene polymers and copolymers in the form of fine particles are disclosed. The particulate compositions essentially consist of (a) styrene polymers containing one or more expanding agents; (b) a polyether derived from propylene oxide and, optionally also from ethylene oxide, and containing polyhydroxy compounds, the polyether being homogeneously dispersed on the surface and preferably also within the expandable particles and (c) optionally, in combination with powdered inorganic and/or organic substances which are homogeneously dispersed on the surface of the polymer particles.