COATED GLASS THREAD FOR REINFORCING POLYMER MATERIALS Russian patent published in 2012 - IPC C03C25/28 B29C70/06 

FIELD: chemistry.

SUBSTANCE: present invention relates to glass threads for reinforcing polymer materials. The glass threads are coated with an aqueous sizing composition containing adhesive film-forming components in form of a mixture of at least one polyvinyl acetate and at least one polyvinyl pyrrolidone, wherein the at least one polyvinyl acetate makes up 70-90% of the weight of solid substance of the mixture. Also, the aqueous sizing composition contains (in wt % in terms of weight of solid substance) 0.1-5 polyvinyl pyrrolidone, 6-20 plasticiser, 3-9 sizing agent, 2-7 combination agent and 0-5 antistatic agent. The obtained glass threads are used as reinforcement when making moulded articles containing a thermosetting matrix, obtained by moulding with spraying of said threads and resins, especially moulding long threads using an injection technique.

EFFECT: prevention of kinking of the thread after unwinding and ensuring integrity of the thread (preventing separation into fibres) after cutting.

15 cl, 1 ex, 1 tbl