Polyurethane resin for coated fabrics, dimethylformamide as the wet-coagulation process solvent, and calcium carbonate filler for textile coating and lamination.
Textile coating and lamination chemistries apply or bond a polymer layer to fabric to add function — water resistance, abrasion resistance, a leather-like hand. The base film-former for most coated fabrics and synthetic leathers is polyurethane (PU). In the solvent (wet-coagulation) process, PU is dissolved in dimethylformamide (DMF) and coagulated in a water bath to build the microporous, breathable structure; calcium carbonate is added as a filler to adjust hand and cost.
The genuine trade-off sits in the solvent. DMF gives PU coagulation its established morphology and surface finish, but it is a restricted substance, which is pushing finishers toward water-based PU dispersions and solvent-free hot-melt lamination. Those routes cut the solvent burden; they do not yet match every hand and breathability spec the DMF route delivers. Decide early which process you are building for, because the PU grade, the filler loading, and the line are not interchangeable between them.
Calcium carbonate is the standard mineral filler in coating compounds: it extends the polymer, controls viscosity and opacity, and lowers compound cost without driving the cure chemistry. Dose it to the rheology and hand you need rather than to a fixed ratio. On DMF, note the regulatory status plainly: it is identified as a substance of very high concern under EU REACH and carries a REACH restriction with a workplace concentration limit. Confirm regulatory status for your application and jurisdiction.
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