Poly(butylene terephthalate) sewing thread

A method of producing a plied sewing thread, comprising the steps of:

• doubling and twisting multifilament yarns, whereby at least one of the multifilament yarns is made from poly(butylene terephthalate), having titer of greater than or equal 20 dtex to give a doubled, tripled or quadrupled twisted thread, dyeing the resultant thread, and coating the dyed thread with a sewing thread lubricant and/or a smoothing agent and/or a binder or a mixture thereof.

A method of producing a plied sewing thread, comprising the steps of:

• twisting a multifilament yarn made from poly(butylene terephthalate) and having titer of from 20 to 550 dtex to give from 200 to 1800 T/m in S-direction, jointly twisting two or three of the resultant S-twisted yarns to give from 180 to 1600 T/m in Z-direction, dyeing the resultant Z-twisted thread, and coating the resultant dyed thread with a sewing thread lubricant and/or a smoothing agent and/or a binder or a mixture thereof.

A method of producing a core spun sewing thread, wherein a sheath of natural or synthetic fibers is wrapped around a multifilament yarn made from poly(butylene terephthalate).

A method of producing an air-intermingled sewing thread, comprising the steps of:

• feeding a first multifilament yarn made from poly(butylene terephthalate) through an air texturing jet to form a core yarn, and feeding a second multifilament yarn through the same said air texturing jet at a higher overfeed than said core yarn.

A method of producing a bonded sewing thread, comprising the steps of:

• plying two or more multifilament yarns, whereby one or more of said multifilament yarns are made from poly(butylene terephthalate), and bonding them together with a polymeric binder.

Use of poly(butylene terephthalate) for manufacturing at least one multifilament yarn of a sewing thread.

Use of multifilament yarns made from poly(butylene terephthalate) for manufacturing a plied, core-spun, intermingled or bonded sewing thread.